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← Theoretical 1

Q6 — Cell Membrane Transport — Arrows X, Y, Z

Theoretical 1 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Plasma Membrane Structure & Transport

There are 3 arrows in the figure: X, Y, Z that show paths of movement of substances through the cell surface membrane.

Cell membrane cross-section with three labelled transport paths, X, Y, and Z. Cell surface membrane cross-section. X passes directly between the phospholipids/membrane proteins; Y passes through a small embedded channel protein; Z passes through a large paired-loop channel protein.

Using the figure, determine whether the following statements are true or false:

A. Vitamin D can be transported through X.
B. Sodium and potassium ions can be transported through X.
C. Large native globular proteins can be transported through Y.
D. Water can be transported through Z.
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Question reproduced from IBO 2022, Theoretical Paper 1, licensed under CC BY-NC-SA 4.0 — attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)