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AQA A Level Biology Chapter 20- Gene Expression
Exam (elaborations) • 7
pages
• 2022
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.

...
AQA A Level Biology Chapter 20- Gene Expression
Last document update:
ago
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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