A-LevelBiologyCell membranes and transport9700/12 · May/June 2025 · Q171 Mark
Cell membranes become less fluid as the temperature decreases. Bacteria and yeast cannot regulate their cell temperatures. How do bacteria and yeast maintain the fluidity of their cell membranes when the temperature decreases? 1 They increase the numbers of unsaturated fatty acids in their phospholipid molecules. 2 They increase the numbers of saturated fatty acids in their phospholipid molecules. 3 They increase the numbers of cholesterol molecules in their cell membranes.
A1 and 3
B1 only
C2 and 3
D2 only
✓ Correct answer
A: 1 and 3
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