One of the primary reasons for generating a large number of clones in a eukaryotic genomic library is that ________
A) lysogenic phages continue to integrate their DNA into the host chromosome, thus reducing the number of desired recombinant clones
B) each cosmid replicates in coordination with the host chromosome
C) the host range of the vector is limited
D) each ligation product is sequence specific
E) each vector can take up only a relatively small fraction of the eukaryotic DNA
E
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In two of Koch's postulates (#2 and #3), a pure culture of the organism is required. Which of the following would NOT be a possible consequence of using a contaminated culture?
A. You can't necessarily attribute the illness directly to the microbe in question-it may in fact be caused by the contaminating microbe. B. There's the possibility that the test animal might be acutely susceptible to the contaminating microbe, but completely resistant to the microbe you suspect causes the illness of interest. As such, when you introduce it into the test animal, it could confuse your final results. C. The problem is that one microbe may be toxic to the other. It may have killed all of your suspect microbe in the culture. Therefore, you can't be sure that you're infecting your test animals with the microbe you suspect is causing the illness, or if it's only the second (contaminating) microbe. D. Even though there's a contaminating microbe present, so long as the original suspect microbe is also present, the disease should still manifest in test animals. It should also still be recoverable from test animals following infection. As such, there's really no consequence to using a contaminated culture.
In the following reaction, galactose is a ________. galactose + glucose ? lactose + water
A) polysaccharide B) monomer C) polymer D) protein
Which of the following occurs in cells of human individuals with three or more X chromosomes?
a. Two X chromosomes remain active, and all others are inactivated. b. One X chromosome remains active, and the rest are inactivated. c. All of the X chromosomes remain active. d. Two X chromosomes remain active in females and one remains active in males; the rest are inactivated.
Which of the following is NOT a domain in Woese and Fox's phykogenetic tree?
A. Plantae B. Bacteria C. Archaea D. Eukarya