What adaptation allows C4 plants to minimize the effects of rubisco's inefficiency at high temperatures?
a. C4 plants fix the carbon twice in two different types of cells.
b. C4 plants fix the carbon twice at two different times of day.
c. C4 plants fix the carbon only once.
d. C4 plants store products in vacuoles.
e. C4 plants only fix carbon at night.
ANSWER: a
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Punctuated equilibrium proposed by Eldredge and Gould in 1972 is an evolutionary process that involves
A. gradual change observable in the fossil record with very little, if any, stasis. B. "spurts" of change observable in the fossil record followed by periods of stasis. C. gradual change observable in the fossil record followed by periods of stasis. D. "spurts" of change observable in the fossil record with very little if any stasis. E. gradual change observable in the fossil record followed by periods of no change at all.
The diploid stage of the red algae life cycle is called:
a. sporophyte. b. zygote. c. gamete. d. gametophyte. e. haptophyte.
Which of the following statements concerning protists is false?
a. All protists are eukaryotic organisms; many are unicellular or colonial. b. The organism that causes malaria is transmitted to humans by the bite of the tsetse fly. c. All apicomplexans are parasitic. d. Cellular slime molds have an amoeboid stage that may be followed by a stage during which spores are produced. e. The euglenozoans that are functionally mixotrophic contain chloroplasts.
Organisms suffering from malnutrition may have a diet deficient in
A) one or more essential nutrients. B) bile and acids needed for digestion. C) digestive enzymes. D) water.