A bacterial cell is suddenly expelled from a warm human intestine into the cold world outside. Which one of the following adjustments might the cell make to maintain the same level of membrane fluidity that the cell had in the intestine?a. increase the length of the hydrocarbon tails in its membrane phospholipids.
b. increase the proportion of unsaturated hydrocarbon tails in its membrane phospholipids.
c. increase the proportion of hydrocarbon tails with no double bonds in its membrane phospholipid.
d. decrease the amount of cholesterol in the membrane.

b. Increase the proportion of unsaturated hydrocarbon tails in its membrane phospholipids.

Explanation:

A bacterial cell in the warm human intestine that has been expelled into the cold world outside has to increase the proportion of unsaturated hydrocarbon tails in its membrane phospholipids to be able to maintain the level of membrane fluidity it experienced in the intestine.

This is because membrane phospholipids are unsaturated fatty acids that have more double bonds and a shorter hydrocarbon tail which prevents them from been tightly packed together thereby increasing the fluidity of the phospholipids in the bacterial cell.

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