What is the function of the cholesterol molecules in a cell membrane? a. they make it thicker. b. they make it porous. c. they make it more fluid. d. they make it less flexible.

Its in a way both C and D as at cholesterol acts as a fluidity buffer that at high temps. the cholesterol makes the membrane less flexible and at lower temps. makes the membrane more fluid

Sorry Hope that helps though 

Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes