OBB Practice Questions - Olimpíada Brasileira De Biologia Exam

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The fluid mosaic model explains the dynamic structural organization of biological membranes. When poikilothermic organisms experience an abrupt decrease in environmental temperature, which homeoviscous adaptation is rapidly implemented to prevent phase transition of membrane lipids into a rigid, non-functional gel state?

Increasing the saturation of phospholipid hydrocarbon tails by converting cis-unsaturated oleic acid chains into fully saturated stearic acid chains, thereby enhancing van der Waals packing density Incorporating a higher proportion of unsaturated fatty acyl chains containing cis-double bonds and modulating cholesterol content to disrupt tight acyl packing Eliminating integral transmembrane proteins from lipid rafts to permit the spontaneous lateral crystallization of sphingomyelins and glycolipids into hexagonal gel clusters Synthesizing longer-chain saturated fatty acids that maximize hydrophobic van der Waals interactions between adjacent phospholipid leaflets to solidify the membrane core

Correct Answer:

Incorporating a higher proportion of unsaturated fatty acyl chains containing cis-double bonds and modulating cholesterol content to disrupt tight acyl packing

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