Explain the role of probes in the search for a specific human gene within a genome library. What will be an ideal response?
ANSWER: Probes, complementary single-stranded RNA or DNA molecules that have a fluorescent or
radioactive label, can come from a variety of sources, such as related genes from other
species. These probes are used to identify and isolate the human version of the same gene.
Probes identify genes in a library by their ability to base pair with the complementary base
sequence in the gene that is being searched for; that binding can be detected by the probe’s
label.
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Another name for non-sister chromatids is:
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A couple has five sons. What is the probability that their next child will be a girl?
A. 0% B. 25% C. 50% D. 75% E. 100%
In antibody-mediated immunity, what happens immediately after B cells are activated?
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What is true about the half-life of 14C?
A. The half-life never changes over time. B. It takes 5,730 years for half of 14C to be converted to 14N. C. It can be employed in the radioisotopic dating of fossils. D. All of these are correct.