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Ocr biology depth unofficial mark scheme 2018
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lionike123
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#1
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
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lionike123
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#2
ShoaibK01
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eesaali128
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#4
I think the asnwer for the "I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent." wanted a value and not a percentage, me and my friends got 1250
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James3184
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#5
floraaax
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#6
for the first question i put amino group instead of amine 😭 do u think they'll accept it
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12KK
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#7
Isn't it because DNA is too big to leave the nucleus to get to the ribosome, so transcription is needed to transcribe them into smaller messenger RNA molecules to leave the nucleus, idk that's what I put..
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ShoaibK01
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#8
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#8
I don’t remember any question where we had to design an experiment for enzymes.
Did I miss a question out accidentally holy ****.
Did I miss a question out accidentally holy ****.
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12KK
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#9
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#9
(Original post by ShoaibK01)
I don’t remember any question where we had to design an experiment for enzymes.
Did I miss a question out accidentally holy ****.
I don’t remember any question where we had to design an experiment for enzymes.
Did I miss a question out accidentally holy ****.
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ShoaibK01
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#10
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#10
(Original post by 12KK)
No I think that's referring to the dead fish question where we had to compare it to copper sulfate or something?!?
No I think that's referring to the dead fish question where we had to compare it to copper sulfate or something?!?
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vareesha123
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#11
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#11
(Original post by 12KK)
Isn't it because DNA is too big to leave the nucleus to get to the ribosome, so transcription is needed to transcribe them into smaller messenger RNA molecules to leave the nucleus, idk that's what I put..
Isn't it because DNA is too big to leave the nucleus to get to the ribosome, so transcription is needed to transcribe them into smaller messenger RNA molecules to leave the nucleus, idk that's what I put..
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vareesha123
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#12
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#12
(Original post by lionike123)
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
“Illegal to trade in endangered species”
Does that really make sense?? I should’ve perhaps put “to make it illegal...”
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lionike123
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#13
(Original post by vareesha123)
For the CITES question , I kind of rushed and didn’t read it properly and as an aim I just put
“Illegal to trade in endangered species”
Does that really make sense?? I should’ve perhaps put “to make it illegal...”
For the CITES question , I kind of rushed and didn’t read it properly and as an aim I just put
“Illegal to trade in endangered species”
Does that really make sense?? I should’ve perhaps put “to make it illegal...”
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vareesha123
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#14
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#14
(Original post by lionike123)
Thats still right. Either way this test was okay for me but lots of people are saying it is hard so maybe the grade boundaries will drop by 2-3marks which is most likely going to happen.
Thats still right. Either way this test was okay for me but lots of people are saying it is hard so maybe the grade boundaries will drop by 2-3marks which is most likely going to happen.
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Ihatebiology_
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#15
pseudoglue
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#16
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#16
(Original post by James3184)
Why is transcription needed to make a protein
Why is transcription needed to make a protein
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hhhhssss
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#17
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#17
(Original post by lionike123)
Thats still right. Either way this test was okay for me but lots of people are saying it is hard so maybe the grade boundaries will drop by 2-3marks which is most likely going to happen.
Thats still right. Either way this test was okay for me but lots of people are saying it is hard so maybe the grade boundaries will drop by 2-3marks which is most likely going to happen.
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layal1226
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#18
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#18
(Original post by lionike123)
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
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lionike123
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#19
(Original post by layal1226)
is this the biology a (as level ) ?
is this the biology a (as level ) ?
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pollyb123
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#20
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#20
(Original post by lionike123)
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
Hey this is the OCR BIOLOGY DEPTH mark scheme. From what im seeing everyone on twitter and in school said the timing of the paper was bad and it was hard.
Okay.
Question about non-competitive inhibitor?
- It binds to the allosteric site, the bonds of the tertiary structure change changing the active site therefore substrate is no longer complementary to the active site, therefore the enzyme is no longer functional.
Tachychardia was the grapth.
Cardiac Output was 5.44 TIMES 10 the power of 3
simpsons index of diversity was 0.73. (Final Answer is only 1 mark so dont worry).
Errors with DNA Purification was that she forgot to add the ethanol and grind the sample. Then describe what the protease or the detergent does.
Last Question was that species eveness was low because of the large jump.
Cardiac Cycle. Atrial Systole, atria wall contract, decreasing volume increasing pressure forcing blood into the Ventricles through the atrioventricular valves which open and is held by tendinous cords. Ventricular Systole, the walls of the ventricles contract decreasing volume increasing pressure, atrioventricular valves close to prevent backflow of blood into the atria, the increased pressure forces the semi-lunar valves to open forcing blood through the aorta and the pulmonary artery at a high pressure. Once all blood has been forced the ventrcles relax and the semi-lunar valves close. Then the atria and ventricles relax blood flows in ventrciles and atria.
Question about the electrical excitation of the heart?
SAN sends a wave of electrical excitation towards the AVN. AVN creates Delay. AVN sends wave of electrical excitation towards the bundle of his to the apex causing the ventricles to contract. Hence the QRS complex represents Ventricular Systole.
First Question:
Amine Group and carboxyl Group.
What bond does it represent and what reaction? It was a peptide bond in a condensation reaction.
Globular Fibrous Proteins- 3 marks if you say globular proteins are soluble and fibrous proteins are insoluble because the hydrophilic R group was on the outside of the globular protein making it soluble. Globular Proteins have metabolic roles such as pepsin which breaks down proteins. Fibrous Proteins have structural roles. 3 marks- Giving examples of fibrous and globular.
Design Experiment for Enzymes Question.
Get three test tubes. Place each sample into test tube. Use equal volume and concentration of the thing i cant remember. Place a tube which is inverted into a water bath which has no air bubbles. Add a tube inside place it in the test tubes and close with a bung. When ready add the thingy and close the bung and measure the water loss.
Three things to improve the experiment
- Wear gloves because her hand could have been contaminated with amino acids.
- Place a glass plate on top of the beaker in order to prevent air born particles from contaminating the chromatography paper and affecting the results.
- Draw a tiny dot on the middle of the line in order to know where to place the sample.
One aim of the cites- Prevents international trade of endangered species or Prevents international trade for commercial reasons.
Elephants population deaths inceased in central and west and include figures. Eastern Africa slighly increased but no as much as central and west and it was recent.
I remember one question where you did 10million-500 thousand divided by 10 million and you get 95 percent.
This is at least 45 marks of the paper.
Vote on this stawpool so we can estimate grade boundaries.
https://www.strawpoll.me/15830987/
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