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Question 22N.2.HL.TZ0.4c.i

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.HL.TZ0.4c.i
Level HL Paper 2 Time zone TZ0
Command term Identify Question number c.i Adapted from N/A
c.i.
[Maximum mark: 1]
22N.2.HL.TZ0.4c.i

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].]

(c.i)

Identify X, the enzyme which copies a DNA sequence.

[1]

Markscheme

RNA polymerase;

Examiners report

About half of candidates knew that X must be RNA polymerase. Some candidates thought that it was DNA polymerase, perhaps because the question referred to copying a DNA sequence. This answer was not accepted as the diagram did not show replication.

Syllabus sections