IB Biology HL 2.1.11 Fatty-Acid Composition and Membrane Fluidity Question Bank

Practise IB Biology HL 2.1.11 through exact HL questions on fatty-acid saturation, membrane packing, temperature adaptation and fluidity evidence.

Exam points

Analyse how saturation, chain structure and packing alter membrane fluidity at different temperatures.
Explain how changing fatty-acid composition can maintain membrane fluidity after a temperature shift.
Use comparative membrane data to justify which fatty-acid composition is more or less fluid.

[Maximum number: 1]

Voltage-gated ion channels are proteins that are embedded in the phospholipid bilayer of plasma membranes. They conduct ions at high rates, regulated by the voltage across the membrane. The diagram shows a typical voltage-gated potassium ( $\mathrm{K}^{+}$ ) channel when it is closed and when it is open.

Figure for Question B2.1.11 (HL)—Fatty acid composition and fluidity question 1 — IB Biology HL

Outline the effect of fatty acids on the fluidity of membranes.

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B2.1.11 (HL)—Fatty acid composition and fluidity question 1