What happens when a keystone species is removed from a population?
a. decreased intraspecific competition
b. increased intraspecific competition
c. species biodiversity decreases
d. species biodiversity increase
c. species biodiversity decreases
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The term filterable viruses was coined by
A. Beijerinck. B. Iwanowsky. C. Twort. D. d'Herelle.
Among cnidarians there are two basic body plans, the medusa and the polyp, which differ in that ________
a. the polyp is motile and the medusa is sessile b. the medusa lacks the mesoglea, a buoyant flexible skeletal layer c. the medusa is motile with its tentacles downward, while the polyp is sessile with its tentacles upward d. the medusa has stinging cells called nematocysts but the polyp does not
Eyes are
a. chemoreceptors. b. mechanoreceptors. c. photoreceptors. d. nociceptors. e. baroreceptors
To prepare large volumes of influenza virus for use in the flu vaccines each year, the virus is grown in embryonated hen eggs. This is an example of the use of
A. selective media. B. enriched media. C. live media. D. complex media.