Hallieallie
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For the Exchange of Substances, Energy Transfers, responses of organisms paper, does anyone have answers for question 3.1, 3.2 and 3.3 at the end of the paper? Would appreciate the help if anyone knows what to do
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Florindag
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Is this the International Edexcel Biology exam?
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Hallieallie
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(Original post by Florindag)
Is this the International Edexcel Biology exam?
It’s AQA, I’ve seen pretty much nobody post about the AQA biology exams
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Florindag
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(Original post by Hallieallie)
It’s AQA, I’ve seen pretty much nobody post about the AQA biology exams
Ah, ok, thanks. Sorry I can't help
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Hallieallie
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(Original post by Florindag)
Is this the International Edexcel Biology exam?
It’s AQA, I’ve seen pretty much nobody post about the AQA biology exams

(Original post by Florindag)
Ah, ok, thanks. Sorry I can't help
That’s okay, thank you anyways
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sheeshhelp
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(Original post by Hallieallie)
It’s AQA, I’ve seen pretty much nobody post about the AQA biology exams


That’s okay, thank you anyways
Hey hallie,
Have u done the biological molecules and cells exam paper - If yes, do u know the answers for questions 01.1 - 01.5. I'm stuck because I don't have the figures
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Hallieallie
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(Original post by sheeshhelp)
Hey hallie,
Have u done the biological molecules and cells exam paper - If yes, do u know the answers for questions 01.1 - 01.5. I'm stuck because I don't have the figures
Yes I have, for 01.1 the carrier protein x is just located in the cell membrane of the cell lining the ileum, and at carrier protein x active transport will happen so obviously that needs energy so the atp hydrolase will break down atp into adp + pi and energy will be released so active transport can happen.
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Hallieallie
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(Original post by sheeshhelp)
Hey hallie,
Have u done the biological molecules and cells exam paper - If yes, do u know the answers for questions 01.1 - 01.5. I'm stuck because I don't have the figures
Then for 01.2, the Na moves out of the cell using a sodium-potassium pump which leaves a lower concentration of Na in the cell lining the ileum compared to outside the cell. This means Na will move down its concentration gradient and go back into the cell using a co-transporter, and it will take glucose with it when it does this as the glucose must move from an area of low concentration to high concentration (against its concentration gradient).
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Hallieallie
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(Original post by Hallieallie)
Yes I have, for 01.1 the carrier protein x is just located in the cell membrane of the cell lining the ileum, and at carrier protein x active transport will happen so obviously that needs energy so the atp hydrolase will break down atp into adp + pi and energy will be released so active transport can happen.
(Original post by sheeshhelp)
Hey hallie,
Have u done the biological molecules and cells exam paper - If yes, do u know the answers for questions 01.1 - 01.5. I'm stuck because I don't have the figures
Then for 01.3 it’s just the cell will have microvilli to increase membrane surface area for increased rate of absorption, they will also mitochondria to supply energy for things such as active transport
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Hallieallie
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01.4 you just need to draw phospholipids in a phospholipid bilayer and the figure is just the protein it mentions in a the question and then you need to draw a phospholipid bilayer around it, on the graph it labels hydrophobic and hydrophilic regions on the protein so you just need to draw the phospholipids in the right area so like with the phosphate in the hydrophilic regions and the fatty acid tails in the hydrophobic regions. Hope that makes sense
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Hallieallie
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(Original post by sheeshhelp)
Hey hallie,
Have u done the biological molecules and cells exam paper - If yes, do u know the answers for questions 01.1 - 01.5. I'm stuck because I don't have the figures
Then 01.5 i just put a condensation reaction joins 3 or more amino acid together by joining the carboxyl group of one amino acid to the amine group of another, forming peptide bonds between each amino acid as this leaves COOH at one end and NH2 at the other. Hope this helps
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Sonnysingh22
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(Original post by Hallieallie)
01.4 you just need to draw phospholipids in a phospholipid bilayer and the figure is just the protein it mentions in a the question and then you need to draw a phospholipid bilayer around it, on the graph it labels hydrophobic and hydrophilic regions on the protein so you just need to draw the phospholipids in the right area so like with the phosphate in the hydrophilic regions and the fatty acid tails in the hydrophobic regions. Hope that makes sense
Can you show how to draw it because I’m really confused, if you can id appreciate it so much
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Tawo-11
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(Original post by Florindag)
Is this the International Edexcel Biology exam?
Have you written the IAS exam?
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