DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ2.13

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ2.13
Level SL Paper 1A Time zone TZ2
Command term Question number 13 Adapted from N/A
13.
[Maximum mark: 1]
21M.1A.SL.TZ2.13

The electron micrograph shows a section through a plant cell.

[Source: Photo © E. Newcomb.]

In which structure(s) is the genome of the cell contained?

A. Z only

B. X, Y and Z only

C. W and X only

D. X and Y only

[1]

Markscheme

B

Examiners report

This question was difficult and did not discriminate well with most candidates opting for A, the nucleus alone rather than response B which included the chloroplast and mitochondrion. Section 3.1 (Genes) in the guide defines the genome as "the whole of the genetic information of an organism". Section 1.5 (The origin of cells) requires the candidates to have reviewed the evidence for the endosymbiotic theory so knowledge that some organelles also carry genetic material would be expected.

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