Digestion of protein begins in the
a. mouth.
b. esophagus.
c. stomach.
d. duodenum.
e. jejunum.
Answer: c
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Which of the following statements about fertilization in humans is false?
A. The fast block to polyspermy involves modifications to the structure of the zona pellucida. B. Sperm must pass through a layer of follicle cells and the zona pellucida before binding to the egg plasma membrane. C. Chemical cues released from the egg guide the movement of sperm. D. Sperm are incapable of fertilizing an egg before undergoing capacitation in the female reproductive tract. E. The oocyte completes meiosis II only after the plasma membranes of the egg and sperm fuse.
The amino acid targets of protein kinases in all GPCR pathways are ____
a. serine and glycine b. serine and tyrosine c. serine and threonine d. glycine and tyrosine e. glycine and threonine
What is an example of a +/? interaction?
A. commensalism B. predation C. both competition and parasitism D. competition E. mutualism
During organ transplant, which feature is the most important to recognize?
Select one: a. the difference between the MHC proteins of the donor and the recipient b. the difference between the blood types of the donor and the recipient c. the similarities between the blood types of the donor and the recipient d. the type of organ being transplanted e. the age of the recipient of the transplanted organ