UNOFFICIAL MARK SCHEME -AQA GCSE Biology Unit 3 - BLY3H - Monday 21st May 2012
Some answers i remember: for SOME parts of question.. (Not official)
Feel free to add or correct any others that you remember!
1.) = 2.5 minutes stopped then started to walk
-- Heart rate increases blood flow therefore providing more oxygen to your body, it also enables your muscles to contract helping them to do more work, provides oxygen for respiration and prevents production of lactic acid
2.)
3.) Fermenter respires Aerobically? Because it said with oxygen, i know usually 'fermenting' means Anaerobically but doesn't it respire Aerobically at first so it can grow and reproduce and then respire Anaerobically to ferment!?
4.) That farmer question - was it so he could produce more fertilizer?
5.)
6.)
Feel free to add or correct any others that you remember!
1.) = 2.5 minutes stopped then started to walk
-- Heart rate increases blood flow therefore providing more oxygen to your body, it also enables your muscles to contract helping them to do more work, provides oxygen for respiration and prevents production of lactic acid
2.)
3.) Fermenter respires Aerobically? Because it said with oxygen, i know usually 'fermenting' means Anaerobically but doesn't it respire Aerobically at first so it can grow and reproduce and then respire Anaerobically to ferment!?
4.) That farmer question - was it so he could produce more fertilizer?
5.)
6.)
The last question completely confused me >.<
I think there was a question about
1)two jars and why they were sealed with a rubber lid and had pure Nitrogen in them.
There was also a question on
2)why were Root Hair cells in plants?
, Why was startch being stored in them...something like that.
3)Something about blood being pumped around body faster and why this was important
4)Why do diabetic people sometimes have Glucose in their urine?
5)Why does the urine of healthy people not have Glucose?
Correct me if I'm wrong, this is what I vaguely remember
I think there was a question about
1)two jars and why they were sealed with a rubber lid and had pure Nitrogen in them.
There was also a question on
2)why were Root Hair cells in plants?
, Why was startch being stored in them...something like that.3)Something about blood being pumped around body faster and why this was important
4)Why do diabetic people sometimes have Glucose in their urine?
5)Why does the urine of healthy people not have Glucose?
Correct me if I'm wrong, this is what I vaguely remember
http://www.thestudentroom.co.uk/showthread.php?t=2007611
try this one peeps - its all complete
try this one peeps - its all complete
Original post by Fordey
What did people put for question 1 I put 5 minutes, I also put for the norweigen farmer question that using fish guts as a source of energy is more expensive because he lives quite far from the sea! Dunno 
Both wrong.
2 and a half mins. And the second one they did not give the price of the fish fat you were suppose to say transportation costs would have been expensive for not alot of difference in methane yeild.
Original post by Basit2010
Both wrong.
2 and a half mins. And the second one they did not give the price of the fish fat you were suppose to say transportation costs would have been expensive for not alot of difference in methane yeild.
2 and a half mins. And the second one they did not give the price of the fish fat you were suppose to say transportation costs would have been expensive for not alot of difference in methane yeild.
First I wrote five and then when I was going over my answers I realised it was 2.5 mins. And for the fish one I wrote the transport costs because he lives far away from the sea.
For the fish one I said he lives far away from the sea to get fish fat. The last question last part I wrote to reduce competition for sugar and so that Dsa is not made inhibiting enzymes which is toxic.
For the question about lidneys that was two marks i said a diabetic person doesn't reabsorb glucose .. What would the second mark be for?
For the question on why is starch stored in plants????????? I Cnt remember what I wrote but what was the answer?
For the second to last one on enzymes and maltose what did you all write? I said yeast uses it so it can respire, the enzyme is present which is able to break down maltose into maltase lol I was chatting complete bs. Also why can yeast not absorb maltose? I sed it's big and made up of two glucose molecules but it had that in the information
Why is nitrogen in the flask? I sed it doesn't react and it's sealed so that oxygen cannot get in CUs we need to maintain anaerobic conditions.
Why is fungus not stirred? I sed it will break the chains of fungi.
The last section if I'm lucky I'll get a few marks. Overall it was an average paper, what do you guys think?
For the question about lidneys that was two marks i said a diabetic person doesn't reabsorb glucose .. What would the second mark be for?
For the question on why is starch stored in plants????????? I Cnt remember what I wrote but what was the answer?
For the second to last one on enzymes and maltose what did you all write? I said yeast uses it so it can respire, the enzyme is present which is able to break down maltose into maltase lol I was chatting complete bs. Also why can yeast not absorb maltose? I sed it's big and made up of two glucose molecules but it had that in the information
Why is nitrogen in the flask? I sed it doesn't react and it's sealed so that oxygen cannot get in CUs we need to maintain anaerobic conditions.
Why is fungus not stirred? I sed it will break the chains of fungi.
The last section if I'm lucky I'll get a few marks. Overall it was an average paper, what do you guys think?
Original post by Kitty.Cat
I think question 5 was about the kidneys? Two substances found in a healthy persons urine - urea and excess mineral ions
i don't think enough people are realising that " excess mineral ions" are not 1 substance....
Original post by MATTTT
Some answers i remember: for SOME parts of question.. (Not official)
Feel free to add or correct any others that you remember!
1.) = 2.5 minutes stopped then started to walk
-- Heart rate increases blood flow therefore providing more oxygen to your body, it also enables your muscles to contract helping them to do more work, provides oxygen for respiration and prevents production of lactic acid
2.)
3.) Fermenter respires Aerobically? Because it said with oxygen, i know usually 'fermenting' means Anaerobically but doesn't it respire Aerobically at first so it can grow and reproduce and then respire Anaerobically to ferment!?
4.) That farmer question - was it so he could produce more fertilizer?
5.)
6.)
Feel free to add or correct any others that you remember!
1.) = 2.5 minutes stopped then started to walk
-- Heart rate increases blood flow therefore providing more oxygen to your body, it also enables your muscles to contract helping them to do more work, provides oxygen for respiration and prevents production of lactic acid
2.)
3.) Fermenter respires Aerobically? Because it said with oxygen, i know usually 'fermenting' means Anaerobically but doesn't it respire Aerobically at first so it can grow and reproduce and then respire Anaerobically to ferment!?
4.) That farmer question - was it so he could produce more fertilizer?
5.)
6.)
Grrr I did two units today so no idea which questions were on which hahaahah.
(edited 11 years ago)
Hi, please answer if you can,
My grades so far for biology- ISA A*, Unit 1 A*
(1) If i get a 'C' in unit 2 because i found it hard and an 'A' in unit 3 what could I expect my overall grade to be? thanks.
(2) If i got a D in unit 2
My grades so far for biology- ISA A*, Unit 1 A*
(1) If i get a 'C' in unit 2 because i found it hard and an 'A' in unit 3 what could I expect my overall grade to be? thanks.
(2) If i got a D in unit 2
Original post by Blue water
Hi, please answer if you can,
My grades so far for biology- ISA A*, Unit 1 A*
(1) If i get a 'C' in unit 2 because i found it hard and an 'A' in unit 3 what could I expect my overall grade to be? thanks.
(2) If i got a D in unit 2
My grades so far for biology- ISA A*, Unit 1 A*
(1) If i get a 'C' in unit 2 because i found it hard and an 'A' in unit 3 what could I expect my overall grade to be? thanks.
(2) If i got a D in unit 2
depends on the ums. you need 360/400 for a*
Right here is what i put please be as critical as possible so i get a fair view of what i get. What do you think? i will put the marks available in brackets
1a) i) The heart rate rises rapidly six times (to a high value) in the thirty minute period meaning they run six times (1)
ii) 2.5 minutes (1)
b) The increaed heart rate increases the blood flow which means that there is more oxygen and glucose delivered to the muscles which is used for respiration. This increaes the rate of respiration so more energy is released and avaialble to the muscles and they use it to contract. The blood flow allow removes co2 and lactic acid, and limits anaerobic respiation (4)
2 a) The nitrogen is used by the microogranisms for growth, the lid prevents microogransism contaminating the culture and oxygen is removed because fermentation needed anaerobic conidtions(2)
ii) Carbon dioxide (1)
b) 0.62 (2)
ii) Adding fish fat, increases the proportion of methane in the biogas. Also adding the fish fat increases the yield of biogas and methane. Increasing the amount of fish fat increases the yield of biogas and methane (3)
c) It would be too expensive(1)
3 a) Aerobic respiration(2)
ii) So that the Fusarium has better access to the nutrients in the solution and to keep them in suspesion (1)
b) The fusarium would get caught and stuck on the paddles(1)
c) Chicken has more protein(1)
ii) Less fat and less cholesterol(2)
4a)The is a higher concentration of these mineral ions in the roots than in the soil so the mineral ions would need to be moved against a concentration gradient and diffusion is along a concentration gradient from a area of high concentration to a area of low conentration (3)
ii) Active transport(1)
b) i) The root hair cells increase the surface area of the roots(1)
ii) Mitochondria is where repsiration takes place and where energy is released. By having more mitochondria, it means that more respiration takes place and more energy is released that can be used for active transport (2)
iii) The Starch is a carbohyrate store that can be broken down to glucose and to use for repsiration to release energy for active transport (1)
5 a) Urea, salt (2)
b) The glucose is filtered out of the blood in the kidneys. The glucose then goes into the kidney tubule and all of it is reabsorbed by active transport so that none is left in the kindey tubule (3)
c) There is too much glucose to be reabsorbed so not all of it is reabsorbed and the isn't enough energy avialable for all of the active tranpsort required (2)
6a) The DAS reduces the amount of fermentation because increasing the DAS concentration, decreases the percentage of alcohol produces. Also, increasing the DAS reduces the percentage of maltose used. When there is no DAS all of the maltose, glucose and fructose is used. When there is DAS, the percentage of maltose used declines but the amount of glucose and fructose isn't affected (3)
b) The Maltose molecure is too large so can't fit through the cell membrane (1)
c) The enzyme digests maltose into two molecules of glucose which can be absorbed by the yeast as it is small enough, but when DAS is present, no enzyme is released so the maltose isn't broken down and the maltose molecule is too large and can't be absorbed by the yeast. (2)
d) 1.DAS reduces the percentage of alcohol produced (1)
2. DAS means that most of the malt extract is not used, so materials are wasted or more has to be (1) used
I think i dropped 13 marks= 32/45 :'( no A* for me
I think i dropped marks here:
1a) i) The heart rate rises rapidly six times (to a high value) in the thirty minute period meaning they run six times (1)- Lose 1 mark
2 a) The nitrogen is used by the microogranisms for growth, the lid prevents microogransism contaminating the culture and oxygen is removed because fermentation needed anaerobic conidtions(2)- Lose 2 marks
5 c) There is too much glucose to be reabsorbed so not all of it is reabsorbed and the isn't enough energy avialable for all of the active tranpsort required (2)- Lose 2 marks
6a) The DAS reduces the amount of fermentation because increasing the DAS concentration, decreases the percentage of alcohol produces. Also, increasing the DAS reduces the percentage of maltose used. When there is no DAS all of the maltose, glucose and fructose is used. When there is DAS, the percentage of maltose used declines but the amount of glucose and fructose isn't affected (3)- Lose 3 marks
6 c) The enzyme digests maltose into two molecules of glucose which can be absorbed by the yeast as it is small enough, but when DAS is present, no enzyme is released so the maltose isn't broken down and the maltose molecule is too large and can't be absorbed by the yeast. (2)-Lose 1
5 a) Urea, salt (2)-Lose 1
2c) It would be too expensive(1)-Lose 1
1b) The increaed heart rate increases the blood flow which means that there is more oxygen and glucose delivered to the muscles which is used for respiration. This increaes the rate of respiration so more energy is released and avaialble to the muscles and they use it to contract. The blood flow allow removes co2 and lactic acid, and limits anaerobic respiation (4)-Lose 1
2ii) So that the Fusarium has better access to the nutrients in the solution and to keep them in suspesion (1) -Lose 1
I keep putting it on, but i'm wating for someone to actually score me
1a) i) The heart rate rises rapidly six times (to a high value) in the thirty minute period meaning they run six times (1)
ii) 2.5 minutes (1)
b) The increaed heart rate increases the blood flow which means that there is more oxygen and glucose delivered to the muscles which is used for respiration. This increaes the rate of respiration so more energy is released and avaialble to the muscles and they use it to contract. The blood flow allow removes co2 and lactic acid, and limits anaerobic respiation (4)
2 a) The nitrogen is used by the microogranisms for growth, the lid prevents microogransism contaminating the culture and oxygen is removed because fermentation needed anaerobic conidtions(2)
ii) Carbon dioxide (1)
b) 0.62 (2)
ii) Adding fish fat, increases the proportion of methane in the biogas. Also adding the fish fat increases the yield of biogas and methane. Increasing the amount of fish fat increases the yield of biogas and methane (3)
c) It would be too expensive(1)
3 a) Aerobic respiration(2)
ii) So that the Fusarium has better access to the nutrients in the solution and to keep them in suspesion (1)
b) The fusarium would get caught and stuck on the paddles(1)
c) Chicken has more protein(1)
ii) Less fat and less cholesterol(2)
4a)The is a higher concentration of these mineral ions in the roots than in the soil so the mineral ions would need to be moved against a concentration gradient and diffusion is along a concentration gradient from a area of high concentration to a area of low conentration (3)
ii) Active transport(1)
b) i) The root hair cells increase the surface area of the roots(1)
ii) Mitochondria is where repsiration takes place and where energy is released. By having more mitochondria, it means that more respiration takes place and more energy is released that can be used for active transport (2)
iii) The Starch is a carbohyrate store that can be broken down to glucose and to use for repsiration to release energy for active transport (1)
5 a) Urea, salt (2)
b) The glucose is filtered out of the blood in the kidneys. The glucose then goes into the kidney tubule and all of it is reabsorbed by active transport so that none is left in the kindey tubule (3)
c) There is too much glucose to be reabsorbed so not all of it is reabsorbed and the isn't enough energy avialable for all of the active tranpsort required (2)
6a) The DAS reduces the amount of fermentation because increasing the DAS concentration, decreases the percentage of alcohol produces. Also, increasing the DAS reduces the percentage of maltose used. When there is no DAS all of the maltose, glucose and fructose is used. When there is DAS, the percentage of maltose used declines but the amount of glucose and fructose isn't affected (3)
b) The Maltose molecure is too large so can't fit through the cell membrane (1)
c) The enzyme digests maltose into two molecules of glucose which can be absorbed by the yeast as it is small enough, but when DAS is present, no enzyme is released so the maltose isn't broken down and the maltose molecule is too large and can't be absorbed by the yeast. (2)
d) 1.DAS reduces the percentage of alcohol produced (1)
2. DAS means that most of the malt extract is not used, so materials are wasted or more has to be (1) used
I think i dropped 13 marks= 32/45 :'( no A* for me
I think i dropped marks here:
1a) i) The heart rate rises rapidly six times (to a high value) in the thirty minute period meaning they run six times (1)- Lose 1 mark
2 a) The nitrogen is used by the microogranisms for growth, the lid prevents microogransism contaminating the culture and oxygen is removed because fermentation needed anaerobic conidtions(2)- Lose 2 marks
5 c) There is too much glucose to be reabsorbed so not all of it is reabsorbed and the isn't enough energy avialable for all of the active tranpsort required (2)- Lose 2 marks
6a) The DAS reduces the amount of fermentation because increasing the DAS concentration, decreases the percentage of alcohol produces. Also, increasing the DAS reduces the percentage of maltose used. When there is no DAS all of the maltose, glucose and fructose is used. When there is DAS, the percentage of maltose used declines but the amount of glucose and fructose isn't affected (3)- Lose 3 marks
6 c) The enzyme digests maltose into two molecules of glucose which can be absorbed by the yeast as it is small enough, but when DAS is present, no enzyme is released so the maltose isn't broken down and the maltose molecule is too large and can't be absorbed by the yeast. (2)-Lose 1
5 a) Urea, salt (2)-Lose 1
2c) It would be too expensive(1)-Lose 1
1b) The increaed heart rate increases the blood flow which means that there is more oxygen and glucose delivered to the muscles which is used for respiration. This increaes the rate of respiration so more energy is released and avaialble to the muscles and they use it to contract. The blood flow allow removes co2 and lactic acid, and limits anaerobic respiation (4)-Lose 1
2ii) So that the Fusarium has better access to the nutrients in the solution and to keep them in suspesion (1) -Lose 1
I keep putting it on, but i'm wating for someone to actually score me
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