Which of the following species is NOT likely to be considered a keystone species?
a. a top predator, such as a wolf, whose diet serve to control the prey population size, which also indirectly affects the abundance and growth of vegetation
b. a fish species that specializes in eating only a few aquatic plant species and that does not form a main component of the diet of the carnivores in the system
c. an insect whose foraging movements result in the movement of pollen and fertilization of many kinds of plant species
d. all of the above are examples that describe keystone species
e. none of the above is an example that describes keystone species
Answer: b. a fish species that specializes in eating only a few aquatic plant species and that does not form a main component of the diet of the carnivores in the system
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Sperm-producing cells are referred to as
a. spermatocytes. b. Sertoli cells. c. interstitial cells. d. seminiferous cells. e. spermatogenic cells.
Which one of the following terms applies to the phylum Nematoda?
A. deuterostome B. diploblastic C. Parazoa D. pseudocoelomate
The loop of Henle in the nephrons of desert-dwelling kangaroo rats is much longer than the loop of Henle in humans. What is the advantage of this increased length for the kangaroo rat?
A. A longer loop of Henle can generate a larger concentration gradient, which allows for the production of a more concentrated urine. B. A longer loop of Henle can generate a smaller concentration gradient, which allows for the production of a more concentrated urine. C. A longer loop of Henle can generate a larger concentration gradient, which allows for the production of a less concentrated urine. D. A longer loop of Henle can generate a smaller concentration gradient, which allows for the production of a less concentrated urine. E. None of the answer options is correct.
Meselson and Stahl relied on equilibrium density gradient centrifugation in a ________ solution to resolve the DNA containing 14N from the DNA containing 15N.
A) radiolabeled phosphate B) calcium chloride C) radiolabeled nitrogen D) sodium acetate E) cesium chloride