Cholesterol within membranes functions as a(n) __________ through its interactions with both hydrophobic and hydrophilic parts of phospholipids
A. pH buffer
B. ebergy source
C. temperature controller
D. fluidity buffer
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Pinocytosis:
A. is engulfment of large particles by the cell
B. involves the specific binding of molecules to receptors on the cell surface
C. is the nonspecific uptake of fluids by pinching inward of the plasma membrane
D. is movement of molecules against the concentration gradient through a permeable membrane
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