The following statements regarding INNATE immunity are true, EXCEPT
A. It is prepared to block the entry of microbes
B. This type of host defense is always present in healthy individuals
C. Rapidly eliminate microbes that succeed in entering host tissues
D. It relies on antibody formation and cell-mediated immunity to achieve its functions
Ans: D. It relies on antibody formation and cell-mediated immunity to achieve its functions
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Following its initial activation, how does a G protein become inactivated?
A. It spontaneously loses activity within a few seconds. B. The G-protein ? subunit containing a GTP eventually reassociates with the G-protein ?? dimer. C. The G-protein ? subunit GTP is hydrolyzed to GDP allowing reassociation of the G-protein ? subunit and ?? dimer. D. The receptor becomes internalized. E. The G-protein ? subunit is digested and recycled.
Life today derives nearly all its energy from ____
a. glucose molecules b. the sun c. hydrothermal vents d. geochemical activity e. radioactive decay
Sperm are stored in the ____ after they are produced
a. epididymis b. seminiferous tubules c. penis d. prostate gland e. vas deferens
According to the data in the accompanying figure, the cause of the decline of the wolf population in 1982 was:a
a sharp decrease in food supply. b. a decrease in the intrinsic rate of increase for the wolf population. c. competition with a newly introduced predator. d. introduction of a disease organism. e. cannot be determined from the data provided.