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Date November 2019 Marks available 1 Reference code 19N.3.SL.TZ0.10
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Identify Question number 10 Adapted from N/A

Question

A sequence of DNA is translated in a continuous reading frame without spaces. Each triplet of nucleotides corresponds to successive amino acids in a polypeptide. The sequence given shows part of one strand of a DNA molecule.

Identify the first triplets of each possible reading frame for this piece of DNA.

[1]
a.

Define what is meant by an open reading frame.

[1]
b.

Markscheme

AAT and ATG and TGC
OR
ATG and TGC and GCG ✔

All three triplets required.

a.

a significant length of DNA that begins with a start codon and ends with a stop codon ✔

Significant length or similar phrase required

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics) » B.2 Biotechnology in agriculture
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Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics)
Option B: Biotechnology and bioinformatics

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