AQA
AS
BIOLOGY
Paper 1
Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
• a ruler with millimetre measurements
• a scientific calculator.
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the...
Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
a ruler with millimetre measurements Questio Mark
a scientific calculator. n
1
Instructions 2
Use black ink or black ball-point pen. 3
Fill in the boxes at the top of this page. 4
Answer all questions.
5
You must answer the questions in the spaces provided. Do
not write outside the box around each page or on blank 6
pages. 7
If you need extra space for your answer(s), use the lined pages at the end of
8
this book. Write the question number against your answer(s).
Show all your working. 9
Do all rough work in this book. Cross through any work you do TOTAL
not want to be marked.
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 75.
1
, 2
Do not write
outside the
Answer all questions in the spaces box
provided.
0 1 .1 Describe the primary structure of all proteins.
[2 marks]
0 1
.2 This question is about the genetic code.
Define universal, non-overlapping and degenerate.
[3 marks]
Universal
Non-overlapping
Degenerate
5
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, 3
Do not write
outside the
Figure
0 21 shows a transmission electron microscope (TEM) image of a Streptococcus box
bacterium.
Figure 1
0 2 .1 Describe how the appearance of the area containing DNA in a TEM
image of a eukaryotic cell would differ from that shown in Figure 1.
[2 marks]
0 2 .2 Describe one difference between the structure of DNA in a prokaryotic
cell and in a eukaryotic cell.
[1 mark]
Question 2 continues on the next page
Turn over ►
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, 4
Do not write
outside the
0 2 .3 Streptococcus bacteria can infect the lungs when air is breathed in and box
cause lung disease.
Describe the mechanism of breathing that causes air to enter the lungs.
[3 marks]
0 2 .4 Some strains of Streptococcus bacteria are more likely to cause lung
disease than other strains.
Strains that do not cause lung disease are quickly destroyed by
phagocytes. Phagocytes are stimulated when they bind to murein on
Streptococcus bacteria.
Each strain of Streptococcus bacteria has a capsule of different thickness
from the others.
Suggest how Streptococcus bacteria with a thicker capsule are more likely to survive
and so cause lung disease.
[2 marks]
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