8. The sigma factor
A.is responsible for recognizing the termination sequence
B.provides the catalytic function of cleaving off pyrophosphates during mRNA synthesis
C.recognizes the promotor
D.accomplishes DNA restriction

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9. The synthesis of mRNA based on a DNA template is called
A.DNA replication
B.transcription
C.translation
D.DNA restriction

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10. Recognition/binding site of RNA polymerase is called
A.receptor
B.promoter
C.facilitator
D.terminator

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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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