11. Which of the following enzyme(s) is/are required for lactose fermentation?

A. Transacetylase
B. β-galactosidase
C. Galactoside permease
D. All of these

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12. Which of these catalyzes the synthesis of RNA from a DNA template?

A. DNA gyrase
B. DNA ligase
C. DNA polymerase
D. RNA polymerase

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13. A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called

A. activation
B. attenuation
C. corepression
D. desiccation

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14. An mRNA transcript of a gene contains

A. a start codon
B. a stop codon
C. a terminator
D. all of these

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15. Which of the following proteins first binds to TATA box during transcription?

A. TF II A
B. TF II D
C. TF II B
D. RNA polymerase

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