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AQA A-LEVEL BIOLOGY PAPER 1, 2 & 3 COMPLETE BUNDLE
(7402/1, 7402/2, 7402/3) – 421 QUESTIONS WITH MARK
SCHEMES & RATIONALES – LATEST SPECIFICATION
# AQA A-LEVEL BIOLOGY PAPER 1 (7402/1)
## Complete Question Paper & Mark Scheme with Rationales
**Topics Covered:** 3.1–3.4 (Biological Molecules, Cells, Exchange, Genetics)
## Section A: Multiple Choice Questions (50 Questions)
**Question 1**
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Which of the following is a monomer used to build polysaccharides?
A) Amino acid
B) Nucleotide
C) Monosaccharide
D) Fatty acid
**Answer:** C
**Rationale:** Polysaccharides (starch, glycogen, cellulose) are polymers made from
monosaccharide monomers (glucose, fructose, etc.). Amino acids (A) form proteins; nucleotides
(B) form nucleic acids; fatty acids (D) form lipids.
---
**Question 2**
The disaccharide lactose is composed of:
A) Glucose + glucose
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B) Glucose + fructose
C) Glucose + galactose
D) Fructose + galactose
**Answer:** C
**Rationale:** Lactose (milk sugar) is a disaccharide formed by condensation of glucose and
galactose. Maltose (A) = glucose+glucose; sucrose (B) = glucose+fructose.
---
**Question 3**
Which test would you use to identify a non-reducing sugar?
A) Biuret test
B) Benedict's test after hydrolysis
C) Emulsion test
D) Iodine test
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**Answer:** B
**Rationale:** Non-reducing sugars (e.g., sucrose) do not reduce Benedict's reagent directly.
They must first be hydrolyzed (with acid or sucrase) into reducing monosaccharides, then
tested with Benedict's.
---
**Question 4**
The primary structure of a protein refers to:
A) The alpha helix folding pattern
B) The sequence of amino acids
C) The 3D arrangement of a single polypeptide
D) The interaction of multiple subunits
**Answer:** B
AQA A-LEVEL BIOLOGY PAPER 1, 2 & 3 COMPLETE BUNDLE
(7402/1, 7402/2, 7402/3) – 421 QUESTIONS WITH MARK
SCHEMES & RATIONALES – LATEST SPECIFICATION
# AQA A-LEVEL BIOLOGY PAPER 1 (7402/1)
## Complete Question Paper & Mark Scheme with Rationales
**Topics Covered:** 3.1–3.4 (Biological Molecules, Cells, Exchange, Genetics)
## Section A: Multiple Choice Questions (50 Questions)
**Question 1**
,2|Page
Which of the following is a monomer used to build polysaccharides?
A) Amino acid
B) Nucleotide
C) Monosaccharide
D) Fatty acid
**Answer:** C
**Rationale:** Polysaccharides (starch, glycogen, cellulose) are polymers made from
monosaccharide monomers (glucose, fructose, etc.). Amino acids (A) form proteins; nucleotides
(B) form nucleic acids; fatty acids (D) form lipids.
---
**Question 2**
The disaccharide lactose is composed of:
A) Glucose + glucose
,3|Page
B) Glucose + fructose
C) Glucose + galactose
D) Fructose + galactose
**Answer:** C
**Rationale:** Lactose (milk sugar) is a disaccharide formed by condensation of glucose and
galactose. Maltose (A) = glucose+glucose; sucrose (B) = glucose+fructose.
---
**Question 3**
Which test would you use to identify a non-reducing sugar?
A) Biuret test
B) Benedict's test after hydrolysis
C) Emulsion test
D) Iodine test
, 4|Page
**Answer:** B
**Rationale:** Non-reducing sugars (e.g., sucrose) do not reduce Benedict's reagent directly.
They must first be hydrolyzed (with acid or sucrase) into reducing monosaccharides, then
tested with Benedict's.
---
**Question 4**
The primary structure of a protein refers to:
A) The alpha helix folding pattern
B) The sequence of amino acids
C) The 3D arrangement of a single polypeptide
D) The interaction of multiple subunits
**Answer:** B
