Initially on activation, effector T cells secrete
a. cytokines.
b. histamine.
c. antibodies.
d. interleukins.
e. interferon.
Answer: a
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According to the competitive exclusion principle, the populations of two species that live in the same place and have exactly the same ecological requirements
A) can coexist at the same carrying capacity (K) as when each population is separate. B) can coexist but with the population of each species at half of the carrying capacity (K) as when each population is separate. C) can coexist but with the population of one species much higher than that of the other species. D) cannot coexist because one species will eventually drive the other to extinction.
Match the correct case study in conservation biology with its animal.
A. fruit bats-introduction of new species B. whales-pollution C. prairie chickens-loss of genetic diversity D. Lake Victoria cichlids-loss of habitat E. songbirds-introduction of new species
________ are cytoplasmic structures that will aggregate mRNA molecules for either degradation or later translation
A) Proteasomes B) Golgi apparatus C) Processing bodies D) Mitochondria E) Ribosomes
A nonprotein component of an enzyme that is loosely attached to the protein component is referred to as a(n) ________.
A. apoenzyme B. prosthetic group C. coenzyme D. holoenzyme