Locate cholesterol within animal membranes and explain its stabilizing effects at high and low temperatures.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2022–2026.
An animal’s survival depends on how its structures and behaviour fit its surroundings. (a) Outline how animal membranes can maintain suitable fluidity in habitats with contrasting temperatures. (b) Describe adaptations that allow herbivores to obtain plant…
Outline how cholesterol affects membrane fluidity.
Why do animal-cell membranes contain cholesterol among their phospholipids? A. It forms the aqueous pore of each ion channel B. It adjusts membrane fluidity across temperature changes C. It joins neighbouring cells by peptide bonds D. It supplies the…
Why do animal-cell membranes contain cholesterol among their phospholipids? A. It forms the aqueous pore of each ion channel B. It adjusts membrane fluidity across temperature changes C. It joins neighbouring cells by peptide bonds D. It supplies the…
What is a major effect of cholesterol within a mammalian plasma membrane? A. It converts the bilayer into a water-soluble layer B. It moderates membrane fluidity across temperature changes C. It actively pumps ions through the hydrophobic core D. It sets the…
The membranes have the same phospholipids but different cholesterol contents. At a high physiological temperature, which membrane would cholesterol make least fluid? A. A B. B C. C D. D
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