12. In simple diffusion a solute
A. Is propelled by random molecular motion
B. Moves up its concentration gradient
C. Moves across a membrane because of an input of freeenergy.
D. Both A and B are correct
E. All of the above are correct
16. Lipolysis is used to
A. Degrade triacylglycerols
B. Prepare triacylglycerols for excretion
C. Remove lipid from membrane
D. Cleave fatty acids into two carbon units
E. Convert fatty acids to glucose
19. The myelin sheath
A. Surrounds nerve cell axons
B. Contains large amounts of cardiolipin
C. Facilitates nerve impulse transmission
D. Both A and B are correct
E. Both A and C are correct
20. Membrane proteins are linked to anchor moleculesthrough a ___________ link
A. Ether
B. Ester
C. Amide
D. Amino
E. Plasma
22. Patients with familialhypercholesterolemia
A. Possess depressed levels of plasma cholesterol
B. Have missing or defective LDL receptors
C. Are homozygous or heterozygous for a nonfunctional LDLreceptor gene
D. Have very high levels of serum cholesterol
E. B, C and D are correct
