DP Biology (first assessment 2025)

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Question 20N.1A.HL.TZ0.2

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.HL.TZ0.2
Level HL Paper 1A Time zone TZ0
Command term Question number 2 Adapted from N/A
2.
[Maximum mark: 1]
20N.1A.HL.TZ0.2

The electron micrograph shows a section through a cell.

[Source: Photo © E. Newcomb. Nucleus, glyoxisomes, chloroplasts, and mitochondria - magnification
at 13,900x - UWDC - UW-Madison Libraries (wisc.edu) (https://search.library.wisc.edu/digital/AE2SBIWRVTRR5T87).]

Which feature of the cell in the micrograph is consistent with the endosymbiotic theory?

A. X has a single membrane.

B. Y has a double membrane.

C. X contains 70S ribosomes.

D. Y contains 80S ribosomes.

[1]

Markscheme

C

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