All actions of the nervous system depend on the transmission of nerve impulses over which of the following?
a) neuroglia
b) efferent pathways
c) afferent pathways
d) neurons
Ans: d) neurons
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Which stage(s) show(s) the diploid portion of the
life cycle? a. A b. B c. C d. D e. D and E
A mother, father, and son live together in the same house. The mother passes a cold to her son. The son then passes the cold to his father. If the virus has not mutated, should the mother be worried about catching the cold again from her husband?
A) No, memory cells will help the mother's immune system to quickly eliminate the virus. B) Yes, although the mother has produced some antibodies to the cold virus, it can still overwhelm her immune system. C) No, the T cells that are left from the previous infection can kill off any virus. D) Yes, the immune system will treat the cold virus like a new infectious agent.
Which of these structures is analogous in function to the tracheoles of insects?
A) Skin of an earthworm B) Body surface of a flatworm C) Bronchi of a human D) Gills of a fish
Which of the following molecules is NOTÂ considered a porphyrin?
A. Chlorophyll B. Vitamin B12 C. Hemoglobin D. Peptidoglycan