While mosses can cover a significant area of land, they are never more than a few centimeters tall. Why do they not grow tall?
A. They are annuals and simply don't live long enough to get very tall.
B. They have no vascular system, so they cannot transport water over long distances.
C. Herbivores constantly eat them to the ground.
D. They don't get enough sunlight to grow tall.
Answer: B
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The gaseous plant hormone is
a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.
What generally triggers the release of calcium ions by ryanodine receptors?
a) potassium efflux b) an action potential c) IP3 uptake d) IP3 release e) sodium influx
Infants born to asymptomatic mothers with recurrent genital herpes are less likely to acquire herpesvirus at birth than infants born to newly infected mothers because
A) maternal antibodies offer protection. B) the disease cannot be transmitted to newborns. C) the disease is not communicable. D) prophylactic antibiotics are administered to the newborn. E) the virus is not growing.
The mode of natural selection in which one extreme phenotype is fittest and the environment selects against the others is
A. Uniformitarianism B. Stabilizing selection C. Disruptive selection D. Artificial selection E. Directional selection