While studying the infection process and life cycle of a newly discovered virus, it was determined that the virus never entered the nucleus of the host cell. This virus may have any of the following genomes except
A. single (-) strand RNA.
B. DNA.
C. double-stranded RNA.
D. single (+) strand RNA.
Answer: B
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If a bacterium carrying a plasmid that confers resistance to ampicillin is placed into medium without ampicillin, it may
A) gain resistance to other antibiotics. B) transfer resistance to other cultures in the laboratory. C) undergo a reversion mutation. D) lose the plasmid because there is no selection for ampicillin resistance.
For most pathogens to be diagnostic of current infection, there must be a(n) _____ in the patient's antibody titer of _____ doubling dilutions
a. decrease; two b. increase; two c. decrease; four d. increase; four
Most of the mass of the solar system is made up of the elements
a. carbon and hydrogen. b. oxygen and hydrogen. c. helium and hydrogen. d. nitrogen and hydrogen. e. nitrogen and carbon.
Investigate sexual selection by completing the sentences.
What will be an ideal response?