<prompt> Function of cholesterol in plasma membrane -Helps in transport of ionsHelps in exocytosisMaintains fluidityHelps in synthesis of bile acids  <response>: Ans. is c i.e.. Maintains fluidity o Roles of cholesterole in cell membrane areCholesterol modifies the fluidity of membrane in two wayAt temperatures below Tm - Increases fluidity.At iemperatures above Tm - Decreases fluidity.Cholesterol affects essential cellular functions through the modulation of particular membrane enzymes.Cholesterol provides cell membrane some extra support.o Option d requires specific mention here. Bile acids are derived from cholesterol. But it is not in plasma membrane, rather it is from intracellular cholesterol. 