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A-level
BIOLOGY
Paper 1
Wednesday 7 June 2023 Afternoon Time allowed: 2 hours
Materials
For Examiner’s Use
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator.
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 pages. 6
• 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.
• Do all rough work in this book. Cross through any work you do not want 9
to be marked. 10
TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 91.
*jun237402101*
IB/M/Jun23/E10 7402/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Give the three structural features found in all virus particles and describe the function
of one of these features.
[2 marks]
1
2
3
Function of one named feature
0 1 . 2 Explain why viruses are described as acellular and non-living.
[2 marks]
0 1 . 3 Give one reason why antibiotics are not effective against viruses.
[1 mark]
5
*02*
IB/M/Jun23/7402/1
, 3
Do not write
outside the
0 2 . 1 Chitin is a polysaccharide. The chitin monomer is a β-glucose molecule with one OH box
group replaced by an NHCOCH3 group. NHCOCH3 can be represented by N(Ac).
Figure 1 shows the monomer that forms chitin and the chitin polymer.
Figure 1
Chitin has a similar structure to cellulose.
Use Figure 1 to describe three ways the structure of chitin is similar to the structure
of cellulose.
[3 marks]
1
2
3
Question 2 continues on the next page
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*03*
IB/M/Jun23/7402/1
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