The cuticle helps a plant conserve water by ____.
A. covering the stomata
B. reducing a plant’s capacity for photosynthesis
C. absorbing visible light
D. restricting the amount of water a plant’s root absorbs
E. restricting the amount of water vapor that diffuses out of aboveground parts
Answer: E
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Studies show that ______ is the optimal amount of stress that people need to positively promote their health and sense of well-being, which coincides with _____ theory.
a. intensity; cognitive consistency b. distress; biological instinct c. eustress; arousal d. eustress; Maslow’s
Which disease is caused by an enveloped virus?
a. hepatitis b. AIDS c. polio d. common colds e. warts
Ants following a trail to the sugar bowl in your kitchen are doing so because of
A. an innate knowledge of where the sugar can be found. B. a dance done by an ant in the anthill. C. chance alone. D. operant conditioning. E. a pheromone pathway laid down by previous ants.
A scientist has been growing a bacterial strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. What has caused this strange result?
A. The bacteria are infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle. B. A prophage switched from the lytic cycle to the lysogenic cycle. C. The bacteria are infected with a temperate phage. D. A prophage switched from the lysogenic cycle to the lytic cyle. E. The bacteria are infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle.