Chapter 20

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AQA A Level Biology Chapter 20- Gene Expression
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7

November 2022

2022/2023

A+
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. ...
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