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36. The binding of lac repressor to DNA could be considered to be analogous to
a. competitive inhibition of an enzyme
b. mixed-type inhibition of an enzyme
c. uncompetitive inhibition of an enzyme
d. allosteric effects in enzyme regulation
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Answer: (a).competitive inhibition of an enzyme

37. Rho-dependent termination of transcription in E. coli
a. requires ATP
b. requires about 50 nucleotides of uncomplexed mRNA
c. both (a) and (b)
d. removes mRNA and holoenzyme from the DNA
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Answer: (c).both (a) and (b)

38. Enhancers are regions that
a. bind RNA polymerase
b. are adjacent to the TATA box
c. are CAT box binding proteins
d. modulate transcription
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Answer: (d).modulate transcription

39. Transcription by E. coli polymerase occurs in
a. four phases known as initiation, propagation, elongation and termination
b. three phases known as initiation, elongation and termination
c. two phases known as initiation and termination
d. none of the above
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Answer: (b).three phases known as initiation, elongation and termination

40. Which of the following is necessary for transcription to occur?
a. DNA molecule
b. RNA polymerase
c. DNA polymerase
d. Both DNA & RNA polymerase
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Answer: (d).Both DNA & RNA polymerase