DP Biology (first assessment 2025)

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Question 22M.1A.HL.TZ2.38

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.HL.TZ2.38
Level HL Paper 1A Time zone TZ2
Command term Question number 38 Adapted from N/A
38.
[Maximum mark: 1]
22M.1A.HL.TZ2.38

The electron micrograph shows sarcomeres in myofibrils of striated muscle during muscle contraction. The lines P–Q and R–S show two regions of one sarcomere.

[Source: Republished with permission of Elsevier - Health Sciences Division from Cell by Don W. Fawcett 1981 ; permission conveyed through Copyright Clearance Center, Inc.]

 

How would regions P–Q and R–S change when the muscle relaxes?

[1]

Markscheme

D

Examiners report

This question was answered correctly by only 33 % of the candidates. Incorrect responses were distributed fairly evenly among the options. The question discriminated well showing the better candidates were answering correctly.

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