DP Biology (first assessment 2025)

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Question 22M.2.SL.TZ1.h

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.SL.TZ1.h
Level SL Paper 2 Time zone TZ1
Command term Suggest Question number h Adapted from N/A
h.
[Maximum mark: 1]
22M.2.SL.TZ1.h

Suggest how the graph would differ for a human during a long period of inactivity.

[1]

Markscheme
  1. more resorption than formation;
  2. PICP/bone formation (always) lower (than in bears);
  3. ICTP/bone resorption (always) higher (than in bears);
  4. ICTP above PICP by a greater amount in humans (than in bears);
Examiners report

Candidates were expected to suggest a difference between the bears and humans in the concentration of one or both of the markers, that would result in loss of bone mass. A common fault was to predict changes in the markers during a period of inactivity in humans, but changes over time were not the issue — it was differences between humans and bears that were relevant to the question.

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