Which region displays an example of the founder effect amongst its population?
a. China
b. Iceland
c. Central Africa
d. the United States
e. the United Kingdom
b
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Ramalina lichens are damaged by nitrates
a. True b. False
Bacteriophages may multiply by a __________
pathway in which the new viral particles are made quickly and released by lysis. Fill in the blank(s) with the appropriate word(s).
Researchers in Alaska were interested in increasing the sockeye salmon (Oncorhynchus nerka) population in three coastal lakes. To accomplish this, the ponds were treated with fertilizers. As a result, zooplankton biomass increased between 40% and 700% in the three lakes. The substantial growth in zooplankton would suggest that prior to these experiments, these lakes were ________.
A. subject to low light levels B. stratified C. oligotrophic D. eutrophic
Which of the following is NOT an advantage of live attenuated vaccine agents?
A) They elicit lifelong immunity. B) They stimulate by cell-mediated and humoral immune responses. C) They occasionally revert to virulent forms. D) They require few or no booster immunizations. E) The immune response generated by the vaccine closely mimics a real infection.