DP Biology (last assessment 2024)

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Question 19N.3.SL.TZ0.10

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.SL.TZ0.10
Level SL Paper 3 Time zone TZ0
Command term Define, Identify Question number 10 Adapted from N/A
10.
[Maximum mark: 2]
19N.3.SL.TZ0.10

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.

(a)

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

[1]

Markscheme

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

All three triplets required.

(b)

Define what is meant by an open reading frame.

[1]

Markscheme

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

Significant length or similar phrase required

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