0 1 . 1 Describe the primary structure of all proteins
0 1 . 2 This question is about the genetic code.
Define universal, non-overlapping and degenerate.
[3 marks]
Universal
Non-overlapping
0 2 . 4 Some strains of Streptococcus bacteria are more likely to cause lung disease than
other strai...
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 1
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 Question Mark
• a scientific calculator. 1
2
Instructions
• 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
6
outside the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• Show all your working.
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*JUN237401101*
IB/M/Jun23/E8 7401/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
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
*02*
IB/M/Jun23/7401/1
, 3
Do not write
outside the
0 2 Figure 1 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 ►
*03*
IB/M/Jun23/7401/1
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