The population below is being subjected to _____
1.directional selection
2.stabilizing selection
3.disruptive selection
4.selection against intermediate forms
2
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The ability to taste PTC and other bitter chemicals is controlled by ____
a. hormone levels that change throughout life b. the presence of fats and sugars in the food being eaten c. the amount of PTC exposure as a child d. the amount of capsaicin present in taste buds e. proteins on the surface of receptor cells
Which cells stimulate B cells to divide and produce antibodies?
a. mast cells b. macrophages c. NK cells d. TC cells e. TH cells
A nosocomial infection is
A) always present, but is inapparent at the time of hospitalization. B) acquired during the course of hospitalization. C) always caused by medical personnel. D) only a result of surgery. E) always caused by pathogenic bacteria.
Why do we distinguish between inter- and intraspecific mutualism?
a. This distinction is for historical reasons only. b. Mutualistic partners in the same species are part of the same gene pool. c. The mutualistic partners do not benefit equally in interspecific mutualism. d. Only intraspecific mutualism gives the opportunity for cheating.