Once the activation energy has been transferred to a molecule,
A) It has reached the transition state.
B) It will always return to the substrate conformation.
C) It will always move on to the product conformation.
D) Both A and C
Answer: A
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The term ductus venosus refers to ________
A) damage to the valves in the veins, leading to varicose veins B) a condition of the aged in which the arteries lose elasticity C) a fetal shunt that bypasses the lungs D) a special fetal vessel that allows umbilical blood to bypass the liver
Catabolism would be best described as a process that ________
A) breaks down complex structures to simpler ones B) elevates glucagon levels C) builds up triglycerides during the postabsorptive state D) causes a decline in circulating ketone bodies
The structures in the nucleus that serve as a "mitotic clock" are
A. hormones.
B. ribosomes.
C. telomeres.
D. kinases.
Which substance does NOT inhibit platelet aggregation?
A. Prostacyclin B. von Willebrand factor C. CD39 D. Nitric oxide