The self-identifying proteins on self body cells are called
A. interferons.
B. interleukin-1.
C. MHC proteins.
D. plasma proteins.
E. perforins.
Answer: C
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An organism is discovered that thrives in both the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight
This organism _____. A) is a normal eukaryotic organism B) is photosynthetic C) is an anaerobic organism D) is a facultative anaerobe
C4 plants have better water conservation abilities than do many other plants (especially C3). This is because:
a) C3 plants are able to keep their stomata closed during the day. b) C4 plants have smaller stomata that are protected by hairs and pits. c) C4 plants open their stomata at night. d) C4 plants have no leaves, they use their stems for photosynthesis. e) C4 plants have the ability to obtain CO2 without opening their stomata.
A ________ cycle is a cyclic path that involves both biological and chemical processes of an ecosystem.
A. hydrological B. biogeochemical C. complete D. complementary