The Hin recombinase of Salmonella typhimurium will function under which of the following conditions?
A. Only when the hix sequences are on the same supercoiled DNA molecule.
B. Only when the hix sequences are oriented in the same direction relative to each other.
C. Only when the Hin recombinase accessory proteins have dissociated will recombinase activity occur.
D. Only when an enhancer sequence is present on a different chromosome than the hix sequences.
E. All of the choices given are correct.
A
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There are many molecular techniques to identify taxonomy of microorganisms. Match each technique to its proper resolution.
A. Mole % G+C B. 16S rDNA sequencing C. Genomic fingerprinting D. Genome sequencing
The development of acute rheumatic fever and subsequent valvular heart disease are problems that may be encountered by patients infected with:
a. Enterococcus faecalis. b. S. pneumoniae. c. S. pyogenes. d. S. agalactiae.
Greenhouse gases cause an increased temperature on the Earth’s surface because they
a. absorb solar radiation. b. help bounce long-wave radiation off of the Earth’s surface. c. trap heat in the atmosphere. d. More than one of these answers is correct
There is a range of color in mice from black to brown to gray to white. In a region of white sand there is a black volcanic deposit. The white mice survive better on the white sand and the black mice survive better on the black volcanic deposit. This could be an example of
A. sexual selection. B. disruptive selection. C. directional selection. D. stabilizing selection.