Refer to the Table Below

question 223

Multiple Choice

Refer to the table below. The data in the table were collected during an analysis of neuronal cell membranes from fish of a single species transferred from a cold environment to a warm one.Which statement is consistent with these data and with what you know about membrane fluidity?

• A) More fluid membranes are formed at lower temperatures than at higher temperatures because of an increase in the ratio of saturated to unsaturated fatty acid chains in membrane phospholipids.
• B) Exposure to higher temperatures results in a shift toward more unsaturated fatty acids in fish membrane phospholipids, which increases the membrane's fluidity.
• C) Membranes are more fluid at higher than at lower temperatures, so to maintain a constant fluidity, fish undergo a shift toward increased saturated fatty acid compositions with increasing temperature.
• D) Fish adjust the fluidity of their cell membranes at high temperatures by increasing the number of double bonds in the fatty acid chains that make up their membrane phospholipid molecules.
• E) Addition of double bonds to fatty acid tails making up membrane phospholipids causes the membrane to become less fluid, so the ratio of saturated to unsaturated fatty acids increases in fish cell membranes as temperature increases.

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