A key feature of enzymes is that they ________ .
a. interact generally within cells
b. are changed by reactions
c. force reactions to occur
d. are not used up in reactions
e. are carbohydrates
Ans: d. are not used up in reactions
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In the figure above, representing transcription, the item labeled "D" is
a. the nontemplate strand. b. RNA-DNA hybrid. c. the template strand. d. DNA double helix. e. the RNA copy.
The most important defense of the cardiovascular system against infection is ________.
A. fever B. lymphocytes in the blood C. lymph nodes D. the blood-brain barrier
To produce recombinants in phage ________
A) one crossover is required B) two crossovers are required C) phage recombinants do not occur D) the F factor must be present E) a bacterial cell must be competent
In order for a substance to transfer a phosphate to ADP in a substrate-level phosphorylation reaction, which of the following must be true?
A. The phosphate donor must have a higher phosphate transfer potential than ATP. B. The phosphate donor must have a higher oxidation-reduction potential than ATP. C. The phosphate donor must have a lower oxidation-reduction potential than ATP. D. The phosphate donor must have a lower phosphate transfer potential than ATP.