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Question 19M.3.SL.TZ2.17b

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.SL.TZ2.17b
Level SL Paper 3 Time zone TZ2
Command term Compare and contrast Question number b Adapted from N/A
b.
[Maximum mark: 2]
19M.3.SL.TZ2.17b

The diagram shows metabolic pathways for lactate in humans.

[Source: © International Baccalaureate Organization 2019]

(b)

Compare and contrast the possible metabolic pathways for lactate in hepatocytes and in mitochondria-rich tissue.

[2]

Markscheme

a. both produce pyruvate «from lactate»
OR
both produce CO2 and H2O «via acetyl CoA» ✔

b. hepatocytes produce glucose from lactate but mitochondria-rich cells cannot ✔

OWTTE – eg: “only hepatocytes produce glucose” would be acceptable.

Examiners report

Part (b) and (c) were well answered, the main error was confusing the hepatocytes with the Kupffer cells.

Syllabus sections