Compare and contrast positive and negative control of gene expression in bacteria
What will be an ideal response?
Both forms of control result from an interaction of a molecule (usually considered to be a protein) with the genetic material (either RNA or DNA). Positive control results when the interaction stimulates transcription, whereas negative control occurs when the interaction inhibits transcription.
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A mutation in an enzyme prevents it from binding substrate. This description is referring to the enzyme's:
A. phenotypic function B. cellular function C. molecular function
MAPK and MEK are intracellular signaling proteins that mediate cell division induced by growth factors. When mutations in the normal MAPK and MEK genes result in an abnormally high level of MAPK and MEK activity and increases in the rate of cell division, then the mutated gene is called a(n)
A. spliceosome. B. transposon. C. tumor-suppressor gene. D. oncogene. E. None of the choices are correct.
Xylem tissue may contain each of these cell types, except which?
A. vessel members B. tracheids C. sieve cells D. fibers E. rays
The following steps are used to produce monoclonal antibodies. What is the fourth step?
A) A B cell is activated to produce antibodies. B) Culture the hybridoma in a selective medium. C) Fuse a B cell to a myeloma cell. D) Isolate antibody-producing B cells. E) Vaccinate a mouse.