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Question 19N.2.SL.TZ0.c

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.2.SL.TZ0.c
Level SL Paper 2 Time zone TZ0
Command term Suggest Question number c Adapted from N/A
c.
[Maximum mark: 1]
19N.2.SL.TZ0.c

A short base sequence of mRNA and a table of the genetic code are shown below.

Sequence of mRNA

Table of the genetic code

Suggest a hypothesis that accounts for the slightly different meaning of some codons in a very limited number of organisms.

[1]

Markscheme

they occurred after the common origin of life OWTTE
OR
the genetic code is not «in fact» universal ✔

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