Exam (elaborations)
AQA A Level Biology Chapter 20- Gene Expression
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1 a i Why is the genetic code described as being universal? (1 mark) a ii The genetic code uses four different DNA bases. What is the maximum number of different DNA triplets that can be made using these four bases? (1 mark) Transcription of a gene produces pre-mRNA. b Name the process that removes base sequences from pre-mRNA to form mRNA. (1 mark) c Figure 1 shows part of a pre-mRNA molecule. Geneticists identified two mutations that can affect this pre-mRNA, as shown in Figure 1. Figure 1 i Mutation 1 leads to the production of a non-functional protein. Explain why. (3 marks) ii What effect might mutation 2 have on the protein produced? Explain your answer (2 marks) AQA Biology, 20
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Institution
San Francisco State University
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Chapter 20
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San Francisco State University
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Chapter 20
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20 gene expression exam style questions
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