Question

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how does lipid composition affect membrane fluidity?
□ saturated fatty acids tend to make the membrane less fluid because they pack together well.
□ unsaturated fatty acids tend to make the membrane less fluid because kinks introduced by the double bonds keep them from packing together well.
□ sphingolipids tend to make the membrane less fluid.
□ lipid composition has no effect on the fluidity of membranes.
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Explanation:

Saturated fatty acids pack closely, reducing membrane fluidity. Sphingolipids also decrease fluidity. Unsaturated fatty acids have kinks from double - bonds, increasing fluidity by preventing tight packing. Lipid composition clearly affects membrane fluidity.

Answer:

Saturated fatty acids tend to make the membrane less fluid because they pack together well.
Sphingolipids tend to make the membrane less fluid.