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← ScienceWhich mechanism causes increased fluidity in molecular membranes with unsaturated lipids?
A)Increased carbon-carbon double bond cis✓
B)Increased van der Waals interaction
C)Increased hydrophobic packing density
D)Increased cholesterol-phospholipid binding
💡 Explanation
The cis configuration causes kinks in the fatty acid chains, resulting in looser packing and increased fluidity because disrupting the hydrophobic interactions weakens the overall IMFs. This increases membrane fluidity, therefore 'increased carbon-carbon double bond cis' is correct rather than tighter packing.
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