Multiple Choice
Which of the following statements concerning saturated fats is not true?
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32. Lipids
Intro to Lipids
Multiple Choice
Which of the following fatty acid compositions would produce the most fluid lipid bilayer?
A
High concentration of cholesterol
B
High concentration of fatty acids
C
High concentration of saturated fatty acids
D
High concentration of unsaturated fatty acids
Verified step by step guidance1
Understand the structure of fatty acids: Fatty acids are long hydrocarbon chains that can be either saturated (no double bonds) or unsaturated (one or more double bonds).
Recognize the role of double bonds: Unsaturated fatty acids contain one or more double bonds, which introduce kinks in the hydrocarbon chain, preventing the molecules from packing closely together.
Consider the effect on membrane fluidity: The kinks caused by double bonds in unsaturated fatty acids increase the distance between adjacent fatty acid chains, enhancing the fluidity of the lipid bilayer.
Compare with other options: Saturated fatty acids, with no double bonds, pack tightly and decrease membrane fluidity. Trans fatty acids, although unsaturated, have a linear configuration similar to saturated fats, also reducing fluidity. Cholesterol can either increase or decrease fluidity depending on temperature and concentration.
Conclude the analysis: A high concentration of unsaturated fatty acids, due to their kinked structure, would disrupt tight packing and result in the most fluid lipid bilayer compared to the other options.
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