Which of the following can result in speciation
within a few generations?
a. development of a physical barrier
b polyploidy
c. postzygotic isolating mechanisms
d. change in environmental conditions
e. the introduction of a new predator into an area
Answer: b
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In formation of plaques by bacteriophages which of the following statements is true?
A. A plaque is the result of several different viruses initially infecting a single cell B. The plaque is the result of a single virus that has replicated in many bacterial cells in a localized area C. A plaque results when a single virus infects one cell and then does not infect any other cell D. Plaques are the areas where cells have not been infected at all
Gingivitis
A. is primarily caused by normal anaerobic biota. B. may involve archaeal species. C. involves the formation of calculus and plaque. D. involves a crevice in the gum along the tooth. E. All of the choices are correct.
Communication among neurons and between neurons and other target cells occurs across short distances at a structure called the __________, a region where the signaling cell and the target cell are very close together.
a. catecholamine b. neurotransmitter c. synapse d. epinepherine
The most damaging type of mutation is a
A. back mutation. B. point mutation. C. frameshift mutation. D. silent mutation. E. All the choices are equally damaging.