DP Biology (first assessment 2025)

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Question 19M.1A.HL.TZ1.30

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.1A.HL.TZ1.30
Level	HL	Paper	1A	Time zone	TZ1
Command term	Deduce	Question number	30	Adapted from	N/A

30.

[Maximum mark: 1]

19M.1A.HL.TZ1.30

The electron micrograph shows a section through part of an animal cell.

[Source: https://en.wikipedia.org/wiki/Mitochondrion#/media/File:Mitochondria,mammalian_lung_-TEM.jpg,
by Louisa Howard.]

Which process is occurring on the structures labelled X?

A. The Krebs cycle

B. The link reaction

C. Glycolysis

D. Phosphorylation of ADP

[1]

Markscheme

D

Syllabus sections

C. Interaction and interdependence » C1.2. Cell respiration » C1.2.11. Oxidation and decarboxylation of pyruvate as a link reaction in aerobic cell respiration

C. Interaction and interdependence » C1.2. Cell respiration » C1.2.12. Oxidation and decarboxylation of acetyl groups in the Krebs cycle with a yield of ATP and reduced NAD

C. Interaction and interdependence » C1.2. Cell respiration » C1.2.13. Transfer of energy by reduced NAD to the electron transport chain in the mitochondrion