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Answer :
If the fatty acids of the cell membrane were completely saturated, a cell would be more permeable. Thus, the correct option is B.
What is a cell membrane?
A cell membrane may be defined as a biological membrane that untangles the interior of all cells from the external environment and shields the cell from its environment.
The presence of saturated fatty acids increases the membrane permeability due to the presence of only single bonds. It increases the transport of molecules between the inner and outer compartments of the cell.
Therefore, the correct option for this question is B.
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Option d is the correct answer. If the fatty acids in a cell membrane are completely saturated, the cell membrane would be less permeable because saturated fatty acid tails are straight and pack closely together, making the membrane denser and more rigid.
If the fatty acids of the cell membrane were completely saturated, the correct option is that the cell would be less permeable. Saturated fatty acids have straight tails that press closely together, making the membrane more dense and rigid. In contrast, unsaturated fatty acids contain kinks or bends due to the presence of one or more C=C double bonds, which create space and increase fluidity in the cell membrane. Increased fluidity allows for more movement and the easier passage of molecules, making the membrane more permeable. Therefore, saturated fatty acid membranes are less fluid and thus less permeable, especially in cold environments where these straight-tail lipids can compress even further.
