1. what is the function of cholesterol in the cell membrane? a. to allow substances to pass through b. to prevent the hydrophobic tails from sticking together c. to make more room inside the cell membrane d. to the cell recognize 'self' and 'non-self' 2. which of the following is a function of the nucleus? select all that apply a. breaks down macromolecules into particles the cell can use b. contains the information needed to make proteins c. directs the activities of the cell d. stores dna