Q1: Suppose a marine mammal is exposed to very low temperatures. Explain how it would maintain the fluidity of cell membranes.


Q2: What is H+/sucrose cotransporter in a plant cell considered (active or passive transport)? Explain.


Q3: When you tally the maximum potential energy yield for the catabolism of one glucose molecule through aerobic pathways, the total comes to 30?32 ATP. These numbers are the?potential maximum. Why are the main reasons for this?

Dear student

Answer 1: - As temperature increases, so does phospholipid bilayer fluidity. At lower temperatures, phospholipids in the bilayer do not have as much kinetic energy and they cluster together more closely, increasing intermolecular interactions and decreasing membrane fluidity.
Organisms exposed to low temperature maintain membrane fluidity by increasing the degree of unsaturation in the fatty-acid chain. The double-bonds introduce kinks in the long hydrocarbon chains and prevent close-packing and stiffening of the membrane.

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