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It should be D, since in cold conditions, fluidity of the cell membrane decreases.The cell surface membranes of plants adapted to cold conditions change as the weather gets colder, allowing the plants to carry out exocytosis. Which change occurs?
A a decrease in the ratio of proteins to saturated phospholipids
B a decrease in the ratio of unsaturated phospholipids to saturated phospholipids
C an increase in the ratio of proteins to unsaturated phospholipids
D an increase in the ratio of unsaturated phospholipids to saturated phospholipids
Unsaturated phospholipids have unsaturated fatty acid tails, which have a "kink" in their shape, and make the bilayer more fluid.