AQA A Level Biology Paper One Revision
AQA A Level Biology Paper One Revision
Questions and Answers (119 Terms)
Updated 2024-2025.
What's the type of bond between glycerol and a fatty acid in a phospholipid? -
Answer: Ester bonds
How would a fatty acid be unsaturated? - Answer: If it contained a double bond
between adjacent carbon atoms in the hydrocarbon chain.
1
, AQA A Level Biology Paper One Revision
Suggest one advantage of the different percentage of cholesterol in red blood cells
compared with cells lining the ileum. - Answer: Red blood cells would be free in
blood, and not supported by other cells which ensures that cholesterol will
maintain its shape.
E. coli has no cholesterol in its cell-surface membrane. Despite this, the cell
maintains a constant shape. Explain why. - Answer: - Cells are unable to change
shape due to the cell having a cell wall.
- This makes the cell rigid since it is made of murein.
Explain the difference between starch molecules and cellulose molecules -
Answer: - Starch formed w a glucose, Cellulose w b glucose
- Position of hydrogen and hydroxyl groups on carbon atom 1 are inverted.
How is starch adapted for its role? - Answer: - Insoluble, meaning that it doesn't
affect water potential.
How is cellulose adapted for its function in plant cells? - Answer: - Long and
straight chains
-Become linked together with hydrogen bonds which form fibrils
- Provides strength for cell wall.
2
, AQA A Level Biology Paper One Revision
How is mRNA produced in the nucleus of a cell? - Answer: DNA helicase breaks
down hydrogen bonds
- One DNA strands acts as a template
- RNA nucleotides exposed to bases
- Attraction linked to the base pairing rule
- RNA Polymerase joins RNA nucleotides together
- Pre-mRNA spliced to remove introns.
Describe the structure of proteins - Answer: - Polymer of amino acids;
- Joined by peptide bonds;
- Formed by condensation;
Describe how proteins are digested in the human gut? - Answer: hydrolysis of
peptide bonds occurs so:
endo - break polypeptides to smaller peptide chains
exo - remove terminal amino acids
di - hydrolyze dipeptides to amino acids
What reducing sugar, or sugars, would you expect to be produced during
chewing? Give a reason for your answer. - Answer: Maltose, since amylase is
produced during chewing.
how is starch similar to cellulose? - Answer: - both are polymers
- both contain glucose
3
AQA A Level Biology Paper One Revision
Questions and Answers (119 Terms)
Updated 2024-2025.
What's the type of bond between glycerol and a fatty acid in a phospholipid? -
Answer: Ester bonds
How would a fatty acid be unsaturated? - Answer: If it contained a double bond
between adjacent carbon atoms in the hydrocarbon chain.
1
, AQA A Level Biology Paper One Revision
Suggest one advantage of the different percentage of cholesterol in red blood cells
compared with cells lining the ileum. - Answer: Red blood cells would be free in
blood, and not supported by other cells which ensures that cholesterol will
maintain its shape.
E. coli has no cholesterol in its cell-surface membrane. Despite this, the cell
maintains a constant shape. Explain why. - Answer: - Cells are unable to change
shape due to the cell having a cell wall.
- This makes the cell rigid since it is made of murein.
Explain the difference between starch molecules and cellulose molecules -
Answer: - Starch formed w a glucose, Cellulose w b glucose
- Position of hydrogen and hydroxyl groups on carbon atom 1 are inverted.
How is starch adapted for its role? - Answer: - Insoluble, meaning that it doesn't
affect water potential.
How is cellulose adapted for its function in plant cells? - Answer: - Long and
straight chains
-Become linked together with hydrogen bonds which form fibrils
- Provides strength for cell wall.
2
, AQA A Level Biology Paper One Revision
How is mRNA produced in the nucleus of a cell? - Answer: DNA helicase breaks
down hydrogen bonds
- One DNA strands acts as a template
- RNA nucleotides exposed to bases
- Attraction linked to the base pairing rule
- RNA Polymerase joins RNA nucleotides together
- Pre-mRNA spliced to remove introns.
Describe the structure of proteins - Answer: - Polymer of amino acids;
- Joined by peptide bonds;
- Formed by condensation;
Describe how proteins are digested in the human gut? - Answer: hydrolysis of
peptide bonds occurs so:
endo - break polypeptides to smaller peptide chains
exo - remove terminal amino acids
di - hydrolyze dipeptides to amino acids
What reducing sugar, or sugars, would you expect to be produced during
chewing? Give a reason for your answer. - Answer: Maltose, since amylase is
produced during chewing.
how is starch similar to cellulose? - Answer: - both are polymers
- both contain glucose
3
