Question

1.) What is the reaction catalyzed by the enzyme reverse transcriptase?

a.  Synthesis of RNA from a DNA template

b. Synthesis of DNA from a single-stranded RNA molecule

c. Cleavage of DNA at a sequence-specific site

d. Circularization of restriction fragments

e. Ligation of DNA fragments

2.) In Bacillus subtilis, regulation of transcription of the trp operon is

A. Controlled solely through attenuation

B. Mediated by a protein denoted TRAP

C. Independent on translation

D. All of the above

E. B and C only

3.) The helix-turn-helix and zinc finger are structural motifs found in

A. Shine-Dalgarno sequences

B. DNA-binding proteins

C. Catabolic enzyme complexes

D. Spliceosomes

Answer 1

Ans1) Reverse transcriptase enzyme helps in-

A) Synthesis of RNA from a DNA template.

A reverse transcriptase is an enzyme used to generate complementary DNA from an RNA template, a process termed reverse transcription.

Ans2)E

Transcription of trp operon mediated by protein denoted TRAP and attenuation.

The Bacillus subtilis tryptophan operon is regulated by transcription attenuation. Transcription is controlled by two alternative RNA secondary structures, which form in the leader transcript.

Ans3)helix turn helix and zinc fingers are structures Found in-

B)

DNA binding proteins