What is one advantage that an RNAi screen may have over a screen for gene knockouts?
What will be an ideal response?
A screen for gene knockouts usually does not yield deletions of essential genes because they are nonviable and do not live. An RNAi screen, however, may often lead to a knockdown, rather than a knockout, of an essential gene, which may be viable. This may lead to better understanding of the function of the gene that may otherwise be difficult to determine.
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The type of RNA that physically interacts with a ribosome, providing the sequence information for a specific protein, is abbreviated:
A. rRNA. B. siRNA. C. mRNA. D. snRNA. E. tRNA.
The skin would be an example of
a. a first line of defense. b. a second line of defense. c. a third line of defense. d. all of these. e. none of these.
Once a macrophage ingests a foreign antigen, how is the antigen presented?
a. The antigen is embedded directly into the cell membrane of the macrophage. b. The antigen is embedded in the membrane of a transport vesicle and released via exocytosis. c. The antigen is attached to a receptor protein, forming a receptor-antigen complex. d. The antigen is attached to MHC markers, forming a MHC-antigen complex e. The antigen becomes part of the T cell membrane.
What kinds of hormonal changes occur as trees prepare for winter dormancy?
What will be an ideal response?