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Question 22N.2.HL.TZ0.c.ii

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.HL.TZ0.c.ii
Level HL Paper 2 Time zone TZ0
Command term Identify Question number c.ii Adapted from N/A
c.ii.
[Maximum mark: 1]
22N.2.HL.TZ0.c.ii

The image shows the regulation of the gene responsible for producing lactase.

[Source: Lac Operon, n.d. [diagram online] T A RAJU. Available at:
https://commons.wikimedia.org/wiki/File:Lac_Operon.svg [Accessed 29 October 2021].]

Identify Y, non-coding DNA at the start of a gene.

[1]

Markscheme

promoter;

Examiners report

Fewer candidates knew that Y must be the promoter. This could be deduced from the diagram which showed that Y is the site to which RNA polymerase first binds. Other incorrect suggestions were primer, intron, start codon and telomere.

Syllabus sections