A-Level H2 Biology (9744) Practice Questions - Singapore-Cambridge GCE A-Level Higher 2 Biology (Syllabus 9744) Exam

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In the fluid mosaic model of the cell surface membrane, what determines the fluidity of the phospholipid bilayer at lower temperatures when more unsaturated fatty acid tails are present?

Kinks in unsaturated tails prevent tight packing, maintaining fluidity Unsaturated tails pack tightly, decreasing fluidity Unsaturated tails form covalent bonds with cholesterol Phospholipids become wholly hydrophobic

Correct Answer:

Kinks in unsaturated tails prevent tight packing, maintaining fluidity

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