TRANSLATION AND REGULATION QUIZ

The Shine-Dalgarno sequence is

the reading frame of a gene

a short sequence that acts as a ribosomal binding site

a stop codon

trailer sequence

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What is the direct cause of cell death by diphtheria toxin?

Formation of an ion channel in the cell membrane

None of these

Induction of apoptosis

Inactivation of a translational elongation factor

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Which of the following molecule catalyzes the transpeptidation reaction?

Peptidyl transferase

DNA ligase

RNA polymerase

DNA polymerase

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Which of the termination codon is called amber?

AUG

UGA

UAG

UAA

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A quorum sensing system

consists of a sensor component that phosphorylates a regulatory protein

senses a compound produced by the bacterium itself

controls the activity of ribosomes directly

detects a signal from the external environment

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What is the maximum number of different amino acids in a polypeptide chain coded by the synthetic polyribonucleotides (UCAG)5?

Two

One

Three

Four

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What are the Svedberg values for the subunits of the 70S ribosomes of E. colli?

40S and 30S

50S and 30S

40S and 20S

50S and 20S

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When was the genetic code completed?

1952

1966

1958

1968

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The final step of gene expression is protein synthesis, which is also known as

transcription

replication

translation

none of these

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What is the action of tetracycline in prokaryotes?

It blocks translocation reaction on ribosomes

Not known with certainity

It blocks the binding of amino-acyl tRNA to the A site of ribosomes

It blocks peptidyl transferase reaction on ribosomes

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