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AQA A LEVEL BIOLOGY 7402/1 PAPER 1 VERSION 1.0 FINAL QUESTION PAPERS & MERGED MARKING SCHEME | JUNE 2023
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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] 53 *03* Turn over ► IB/M/Jun23/7402/1 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.
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AQA A LEVEL BIOLOGY
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