DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.3

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ1.3
Level SL Paper 1A Time zone TZ1
Command term Question number 3 Adapted from N/A
3.
[Maximum mark: 1]
23M.1A.SL.TZ1.3

Cytochrome reductase is a transmembrane protein which acts as a H+ channel in respiration. Which characteristic allows cytochrome reductase to be a transmembrane protein?


A.  It is hydrophilic except for the central core which is a hydrophobic channel.

B.  It has hydrophobic regions embedded in the membrane and hydrophilic regions exposed on both sides of the membrane.

C.  It has a hydrophobic central core acting as a channel and a hydrophilic region embedded in the membrane.

D.  It is hydrophobic except for the part in contact with the phospholipid membrane.

[1]

Markscheme

B