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IB Biology HL B2.1.6 Channel Proteins Questions

Analyse how channel proteins form selective hydrophilic routes for ions and polar solutes, allowing passive gradient-driven movement without ATP in IB Biology HL B2.1.6.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain why polar amino acids line channels that carry ions or hydrophilic solutes.
  • Describe channel-mediated diffusion as selective, passive movement down a gradient without ATP, ending at equilibrium.
  • Interpret chloride-concentration graphs showing facilitated-diffusion rate rising then levelling off.

IB Biology HL B2.1.6 Channel Proteins Questions 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 IB Biology HL B2.1.6 Channel Proteins Questions 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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