An example of a nonpolar signaling molecule is ____
a. epinephrine
b. insulin
c. testosterone
d. growth factors
e. neurotransmitters
ANSWER: c
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The soils in which most plants do best are
a. mixtures of mainly sand and silt. b. sandy soils. c. soils made mostly of humus. d. clay soils. e. loams.
Energy is defined as
A. change. B. the capacity to do work. C. heat. D. movement.
As the concentration of an enzyme increases for a given substrate,
A. the reaction rate increases similarly. B. the turnover number decreases at the same rate that the enzyme concentration increases. C. the rate of the reaction decreases to a point. D. there is no change in the reaction.
A young farmer purchases some land in a relatively arid area and is interested in earning a reasonable profit for many years. Which of the following strategies would best allow the farmer to achieve such a goal?
A) establishing an extensive irrigation system B) using plenty of the best fertilizers C) finding a way to sell all parts of crop plants D) selecting crops adapted to arid areas