Question 1

Paper 2Medium4 marks

Figure 1 shows a stage in the elongation of a polypeptide during protein synthesis.

ribosome5′3′AUGGCUUUUCAAgrowing polypeptide chain3′-CGA-5′
(a)

State the next mRNA codon to be translated as elongation continues.

[1]
(b)

Explain how the ribosome adds the next amino acid and continues elongation from the stage shown in Figure 1.

[3]

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