AQA AS BIOLOGY Paper 1 JUNE 2024 MARK SCHEME

A level



AQA
AS
BIOLOGY
7401/1
Paper 1
Final Mark scheme
June 2024

,Question Marking Guidance Mark Comments

1. (A) Trachea; 2 1. Accept cartilage
01.1 (2 x
2. (B) External intercostal (muscle); AO1
)

Question Marking Guidance Mark Comments

3 correct = 2 marks;;
2 correct = 1 mark;
1 correct = 0 marks

Box Statement

F represents the diffusion of oxygen 2
01.2 (2 x
AO1)
represents the transport of a
D
gas mixture


represents blood moving at the
C
highest pressure


Question Marking Guidance Mark Comments

1. (Epithelium is) single cell layer Ignore reference
to surface area
OR
2 1. Accept one
(Epithelium contains) thin/flat cells
01.3 (2 x cell thick
OR AO1 1. Accept “has
Epithelium is thin; ) squamous
2. (So) short diffusion pathway/distance; epithelium”

, Question Marking Guidance Mark Comments


1. Amylase;
2. Glycosidic;
3. Peptide; 3. Reject
4. Amino acid(s); dipeptide/
4 polypeptide
02.1 Biological Name of bond Product of (4 x bond
Enzyme AO1
molecule hydrolysed digestion
)
Amylas Glycosidi
e c
Amin
Peptide
o
acid(s
)

Question Marking Guidance Mark Comments

1. Add biuret (solution); 1. Reject burette
or Beirut
2. Purple (colour produced);
1. Reject heat
1. Accept a
description of the
2 biuret test: eg
02.2 (2 x copper sulfate and
AO1) sodium hydroxide
or CuSO4 + NaOH
or alkaline copper
sulfate
2. Accept
lilac/violet/mauve
for purple

Question Marking Guidance Mark Comments

1. (Positive because) enzymes are protein; Accept correct
answer in any
order
2. (Because) enzymes not used up (in 2
02.3 reactions) (2 x 2. Accept
AO2) enzymes reused
OR for enzymes not
used up
(Because) enzymes still present;
2. Presence of
enzyme after
reaction must be
implied