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IB Biology HL 2.1.6 Channel Proteins Question Bank

Practise IB Biology HL 2.1.6 through exact HL questions on channel architecture, charge selectivity, transport-rate data and the limits of passive membrane movement.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse how channel structure, charge and selectivity determine movement of ions or polar solutes.
  • Use concentration–rate data to distinguish channel-limited transport from a simple gradient effect.
  • Compare channel and carrier pathways while explaining why both remain passive down a gradient.

B2.1.6—Channel proteins question 1

[Maximum number: 1]

The diagram shows protein channels involved in the passive movement of a substance into the cell across the cell membrane.

Figure for Question B2.1.6—Channel proteins question 1 — IB Biology HL

What describes this movement?

A

Energy of ATP is used to transport substances into the cell.

B

Substances can move from areas of low to areas of high concentration.

C

The proteins ensure that movement of substances is only in one direction.

D

Net movement occurs until the concentrations in and out of the cell are equal.

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