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    Hi guys, hope we all smashed that exam, it was kind of good. Here are my answers that I managed to jot down. Please add your own too
    1) a) i) Age ii) General increase in heart rate, avg 52 Beats per min iii) Zebrafish is transparent - easy to see heart etc. Abundant/not rare
    iv)verterbrate unlike daphnia so feels pain
    b) i) A ii) D
    2) a) i) B ii) Diffusion through cell membrane only because single celled & low SA:VOL ratio
    b) Alveoli - increase surface area etc
    c) 1.05%
    d) steepen concentration gradient to make up for high SA:VOL ratio caused by enlarged sacs
    3) a) dipolar (explain) glucose attracted, cohesion etc
    b) polar, requires channel/carrier protein therefore is facilitated diffusion
    c) osmotic effect of glucose. Glycogen insoluble and not polar. Glucose is soluble and polar.
    d) i) a-Glucose, 1-4 Glycosidic bonds
    ii) Angles of 1-4 glycosidic bonds between a-glucose makes it coil up ->compact. Also insoluble so isnt hydrolysed and glucose not used up until necessary.
    4) a) A
    b) forgot my answer :/
    c) repeat and get average
    5) a) D
    b) i) wtf was that diagram ii) A
    c) i) 27.7% ii) C iii) stored as tryglyceride
    d) Explain what CF is and how it happens (chloride ions not being released into mucus etc), mucus builds up in tube between pancreas and small intestine, less digestion, malnourishment, requires higher energy intake.
    6) a) collagen - strength to withstand ; elastic fibres - contract to maintain high blood pressure
    b) i) atherosclerosis explanation ii) increases blood pressure, risk of another damage and inflammatory response iii) B - antihypertensive
    7) a) described structure of mononucleotide, phosphodiester bonds through condensation reactions between phoshate of one and pentose of another. hydrogen bonds, complementary base pairing.
    b) just explain mesehlson-stahl findings and how its semi-conservative
    c) both have pentose sugar but in DNA its DEOXYRIBOSE and in ATP its RIBOSE. both have phosphate but ATP had triphosphate. Both have nitrogenous base.
    8) a) catalyses reactions in organisms by reducing activation energy.
    b) i) say collagen is fibrous and enzyme is globular. both consist of polypeptide chains made of amino acids linked with peptide bonds. fibrous have little/no tertiary structure, globular does. explain solubility and insolubility and fibrous has a structural role while glob has functional
    ii) 5 different solutions, same volume different concentration. place 5 pieces of same mass collagen and leave for set time. use colorimeter. more colour = less activity.
    c) not really valid bc could just be due to enzyme being used up, didnt use control with 0% concentration to compare.

    Hope we all smashed it. Please correct any mistakes ^
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    (Original post by ismail55325)
    Hi guys, hope we all smashed that exam, it was kind of good. Here are my answers that I managed to jot down. Please add your own too
    1) a) i) Age ii) General increase in heart rate, avg 52 Beats per min iii) Zebrafish is transparent - easy to see heart etc. Abundant/not rare
    iv)verterbrate unlike daphnia so feels pain
    b) i) A ii) D
    2) a) i) B ii) Diffusion through cell membrane only because single celled & low SA:VOL ratio
    b) Alveoli - increase surface area etc
    c) 1.05%
    d) steepen concentration gradient to make up for high SA:VOL ratio caused by enlarged sacs
    3) a) dipolar (explain) glucose attracted, cohesion etc
    b) polar, requires channel/carrier protein therefore is facilitated diffusion
    c) osmotic effect of glucose. Glycogen insoluble and not polar. Glucose is soluble and polar.
    d) i) a-Glucose, 1-4 Glycosidic bonds
    ii) Angles of 1-4 glycosidic bonds between a-glucose makes it coil up ->compact. Also insoluble so isnt hydrolysed and glucose not used up until necessary.
    4) a) A
    b) forgot my answer :/
    c) repeat and get average
    5) a) D
    b) i) wtf was that diagram ii) A
    c) i) 27.7% ii) C iii) stored as tryglyceride
    d) Explain what CF is and how it happens (chloride ions not being released into mucus etc), mucus builds up in tube between pancreas and small intestine, less digestion, malnourishment, requires higher energy intake.
    6) a) collagen - strength to withstand ; elastic fibres - contract to maintain high blood pressure
    b) i) atherosclerosis explanation ii) increases blood pressure, risk of another damage and inflammatory response iii) B - antihypertensive
    7) a) described structure of mononucleotide, phosphodiester bonds through condensation reactions between phoshate of one and pentose of another. hydrogen bonds, complementary base pairing.
    b) just explain mesehlson-stahl findings and how its semi-conservative
    c) both have pentose sugar but in DNA its DEOXYRIBOSE and in ATP its RIBOSE. both have phosphate but ATP had triphosphate. Both have nitrogenous base.
    8) a) catalyses reactions in organisms by reducing activation energy.
    b) i) say collagen is fibrous and enzyme is globular. both consist of polypeptide chains made of amino acids linked with peptide bonds. fibrous have little/no tertiary structure, globular does. explain solubility and insolubility and fibrous has a structural role while glob has functional
    ii) 5 different solutions, same volume different concentration. place 5 pieces of same mass collagen and leave for set time. use colorimeter. more colour = less activity.
    c) not really valid bc could just be due to enzyme being used up, didnt use control with 0% concentration to compare.

    Hope we all smashed it. Please correct any mistakes ^
    What do you think the grade boundaries are this year?
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    (Original post by ella.k00)
    What do you think the grade boundaries are this year?
    tbh i think they're going to be around the same, but all Edexcel have done this year is screw us over so lets see
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    (Original post by ismail55325)
    Hi guys, hope we all smashed that exam, it was kind of good. Here are my answers that I managed to jot down. Please add your own too
    1) a) i) Age ii) General increase in heart rate, avg 52 Beats per min iii) Zebrafish is transparent - easy to see heart etc. Abundant/not rare
    iv)verterbrate unlike daphnia so feels pain
    b) i) A ii) D
    2) a) i) B ii) Diffusion through cell membrane only because single celled & low SA:VOL ratio
    b) Alveoli - increase surface area etc
    c) 1.05%
    d) steepen concentration gradient to make up for high SA:VOL ratio caused by enlarged sacs
    3) a) dipolar (explain) glucose attracted, cohesion etc
    b) polar, requires channel/carrier protein therefore is facilitated diffusion
    c) osmotic effect of glucose. Glycogen insoluble and not polar. Glucose is soluble and polar.
    d) i) a-Glucose, 1-4 Glycosidic bonds
    ii) Angles of 1-4 glycosidic bonds between a-glucose makes it coil up ->compact. Also insoluble so isnt hydrolysed and glucose not used up until necessary.
    4) a) A
    b) forgot my answer :/
    c) repeat and get average
    5) a) D
    b) i) wtf was that diagram ii) A
    c) i) 27.7% ii) C iii) stored as tryglyceride
    d) Explain what CF is and how it happens (chloride ions not being released into mucus etc), mucus builds up in tube between pancreas and small intestine, less digestion, malnourishment, requires higher energy intake.
    6) a) collagen - strength to withstand ; elastic fibres - contract to maintain high blood pressure
    b) i) atherosclerosis explanation ii) increases blood pressure, risk of another damage and inflammatory response iii) B - antihypertensive
    7) a) described structure of mononucleotide, phosphodiester bonds through condensation reactions between phoshate of one and pentose of another. hydrogen bonds, complementary base pairing.
    b) just explain mesehlson-stahl findings and how its semi-conservative
    c) both have pentose sugar but in DNA its DEOXYRIBOSE and in ATP its RIBOSE. both have phosphate but ATP had triphosphate. Both have nitrogenous base.
    8) a) catalyses reactions in organisms by reducing activation energy.
    b) i) say collagen is fibrous and enzyme is globular. both consist of polypeptide chains made of amino acids linked with peptide bonds. fibrous have little/no tertiary structure, globular does. explain solubility and insolubility and fibrous has a structural role while glob has functional
    ii) 5 different solutions, same volume different concentration. place 5 pieces of same mass collagen and leave for set time. use colorimeter. more colour = less activity.
    c) not really valid bc could just be due to enzyme being used up, didnt use control with 0% concentration to compare.

    Hope we all smashed it. Please correct any mistakes ^

    1 B ii. A
    2 B ii. Surely if its a single celled organism it has a large SA:V ratio
    3 D ii. Glycogen is easily hydrolysed because it has branches.
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    (Original post by H1.Hashim)
    1 B ii. A
    2 B ii. Surely if its a single celled organism it has a large SA:V ratio
    3 D ii. Glucose is soluble
    the glycogen is insoluble not the glucose, the q was on glycogen and what was question 1bii again? thanks
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    (Original post by ismail55325)
    the glycogen is insoluble not the glucose, the q was on glycogen and what was question 1bii again? thanks
    It was about the blood pressure and we had to pick one of the arrows I believe
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    Is this new or old spec?
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    (Original post by H1.Hashim)
    It was about the blood pressure and we had to pick one of the arrows I believe
    so wouldnt it be D, straight after the blood leaves the heart?
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    (Original post by glad-he-ate-her)
    Is this new or old spec?
    New
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    (Original post by ismail55325)
    New
    Are you guys the ones who got a 6 marker on what affects a microscopes resolution?
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    (Original post by H1.Hashim)
    1 B ii. A
    2 B ii. Surely if its a single celled organism it has a large SA:V ratio
    3 D ii. Glycogen is easily hydrolysed because it has branches.
    For 2 b ii. I said shorter diffusion thickness given that its 1 cell thick so diffusion from surroundings is adequate to supply cell organs, would this be correct?
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    (Original post by glad-he-ate-her)
    Are you guys the ones who got a 6 marker on what affects a microscopes resolution?
    nope
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    (Original post by Jturner05)
    For 2 b ii. I said shorter diffusion thickness given that its 1 cell thick so diffusion from surroundings is adequate to supply cell organs, would this be correct?
    probably, it makes sense
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    (Original post by ismail55325)
    nope
    is this edexcel biology b or a
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    (Original post by glad-he-ate-her)
    is this edexcel biology b or a
    biology A
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    (Original post by ismail55325)
    Hi guys, hope we all smashed that exam, it was kind of good. Here are my answers that I managed to jot down. Please add your own too
    1) a) i) Age ii) General increase in heart rate, avg 52 Beats per min iii) Zebrafish is transparent - easy to see heart etc. Abundant/not rare
    iv)verterbrate unlike daphnia so feels pain
    b) i) A ii) D
    2) a) i) B ii) Diffusion through cell membrane only because single celled & low SA:VOL ratio
    b) Alveoli - increase surface area etc
    c) 1.05%
    d) steepen concentration gradient to make up for high SA:VOL ratio caused by enlarged sacs
    3) a) dipolar (explain) glucose attracted, cohesion etc
    b) polar, requires channel/carrier protein therefore is facilitated diffusion
    c) osmotic effect of glucose. Glycogen insoluble and not polar. Glucose is soluble and polar.
    d) i) a-Glucose, 1-4 Glycosidic bonds
    ii) Angles of 1-4 glycosidic bonds between a-glucose makes it coil up ->compact. Also insoluble so isnt hydrolysed and glucose not used up until necessary.
    4) a) A
    b) forgot my answer :/
    c) repeat and get average
    5) a) D
    b) i) wtf was that diagram ii) A
    c) i) 27.7% ii) C iii) stored as tryglyceride
    d) Explain what CF is and how it happens (chloride ions not being released into mucus etc), mucus builds up in tube between pancreas and small intestine, less digestion, malnourishment, requires higher energy intake.
    6) a) collagen - strength to withstand ; elastic fibres - contract to maintain high blood pressure
    b) i) atherosclerosis explanation ii) increases blood pressure, risk of another damage and inflammatory response iii) B - antihypertensive
    7) a) described structure of mononucleotide, phosphodiester bonds through condensation reactions between phoshate of one and pentose of another. hydrogen bonds, complementary base pairing.
    b) just explain mesehlson-stahl findings and how its semi-conservative
    c) both have pentose sugar but in DNA its DEOXYRIBOSE and in ATP its RIBOSE. both have phosphate but ATP had triphosphate. Both have nitrogenous base.
    8) a) catalyses reactions in organisms by reducing activation energy.
    b) i) say collagen is fibrous and enzyme is globular. both consist of polypeptide chains made of amino acids linked with peptide bonds. fibrous have little/no tertiary structure, globular does. explain solubility and insolubility and fibrous has a structural role while glob has functional
    ii) 5 different solutions, same volume different concentration. place 5 pieces of same mass collagen and leave for set time. use colorimeter. more colour = less activity.
    c) not really valid bc could just be due to enzyme being used up, didnt use control with 0% concentration to compare.

    Hope we all smashed it. Please correct any mistakes ^
    wow i think I did okay then
    lol for that question for UK death rate per 10000 i got 1 in 95 im not sure because people were putting percentages i did 10000/105
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    Anyone got any clue of what the grade boundaries are gonna be looking like?
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    (Original post by ismail55325)
    probably, it makes sense
    Okay phew😂 Also, for 8c, the enzyme isn't used up, it's the substrate going from reactants to products!
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    (Original post by Jturner05)
    Okay phew😂 Also, for 8c, the enzyme isn't used up, it's the substrate going from reactants to products!
    Ahhh hope i get marks for saying there wasn't a comparison with 0% solution
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    (Original post by kk2000)
    wow i think I did okay then
    lol for that question for UK death rate per 10000 i got 1 in 95 im not sure because people were putting percentages i did 10000/105
    I did both and got 1.05% chance or 1 in 95 chance
 
 
 
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