What are the three main stages of the transcription reaction?
What will be an ideal response?
Ans: The three main stages of the transcription reaction are: 1) template recognition, which occurs when RNA polymerase binds double-stranded DNA at a promoter, and initiation, which occurs when the first nucleotide bonds in RNA are synthesized; 2) elongation, which occurs when RNA polymerase moves along the DNA and extends the RNA chain; and 3) termination, which occurs when the formation of RNA stops and the transcription complex comes apart.
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EMB agar preferentially selects for the growth of ________ bacteria
A) gram-positive B) gram-negative C) gram-variable D) both gram-positive and gram-negative
The key structural difference between DNA and RNA is
A. RNA is a protein, while DNA is a nucleic acid. B. RNA is a polymer, but DNA is not. C. As their names indicate, DNA contains deoxyribose, whereas RNA contains ribose. Thus, DNA contains a different sugar than RNA. D. RNA is a double helix, but DNA is not. E. All the bases in DNA differ from those in RNA.
Which of the following is the concept associated with an animal shivering in a cold environment to stay warm?
A) homeostasis B) conformer C) counter current heat exchange D) torpor
Choose the TRUE statement(s) about a drug that blocks the ability of vasopressin to bind to its receptors on the collecting duct. (Select all that apply.)
a. There will be more aquaporin molecules on the apical membrane of the collecting duct. b. Urinary water output will increase. c. More water will be reabsorbed across the collecting duct. d. This drug could be very dangerous for a person deprived of water in the desert.