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Question 18N.3.SL.TZ0.10c

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.SL.TZ0.10c
Level SL Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
18N.3.SL.TZ0.10c

A section of mRNA contains the start codon for translation of a polypeptide by the ribosomes.

(c)

Within the base sequence shown in the diagram, the sequence for the stop codon UGA appears. Explain the reasons for translation continuing beyond this point in the mRNA.

[2]

Markscheme

a. the gene code occurs in triplets ✔

b. the stop codon would not be part of the reading frame ✔

c. the code for a polypeptide would contain more codons ✔

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