TRANSLATION AND REGULATION QUIZ

An mRNA transcript of a gene contains

a stop codon

all of these

a start codon

a terminator

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Which of the following enzyme is used for synthesis of RNA under the direction of DNA?

DNA ligase

RNA ligase

RNA polymerase

DNA polymerase

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The synthesis of mRNA based on a DNA template is called

transcription

translation

DNA restriction

DNA replication

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The components found in all prokaryotic transcription terminators is

a hairpin structure

none of these

Rho factor

a poly-U region

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Which of the following component of RNA polymerase facilitates the recognition of promoter sequences?

b subunit

c subunit

s subunit

a subunit

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The location of first hexameric sequence typically found in pro-karyotic promoters is

at the transcription start site

approximately 35 bases upstream of the transcription start site

approximately 10 bases upstream of the transcription start site

approximately 25 bases upstream of the transcription start site

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

corepression

attenuation

activation

desiccation

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

Galactoside permease

β-galactosidase

Transacetylase

All of these

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Which of the following is a product of transcription?

tRNA

all of these

rRNA

mRNA

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Which of the following statement defines a replicon?

A DNA template which is used in transcription

A DNA molecule that is able to replicate and be maintained

The enzyme responsible for transposition

A DNA molecule that encodes pili for conjugation

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