TRANSLATION AND REGULATION QUIZ

Which binding is inhibited by pactamycin?

Peptidyl t-RNA to the 50S subunit

Aminoacyl-tRNA to the A-site of 30S subunit

Formation of peptide bond in P site

Initiator-tRNA to 30S/40S initiation complexes

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What is the action of tetracycline in prokaryotes?

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

It blocks peptidyl transferase reaction on ribosomes

Not known with certainity

It blocks translocation reaction on ribosomes

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

None of these

Formation of an ion channel in the cell membrane

Inactivation of a translational elongation factor

Induction of apoptosis

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Three stop codons, which aids in termination of translation are also known as

antisense codons

pause codons

missense codons

nonsense codons

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

40S and 20S

50S and 20S

40S and 30S

50S and 30S

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Which of the following three codons translate as serine (Ser)?

AGU

CAU

AUG

CGA

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Negative regulation of protein synthesis is accomplished by

the binding of a repressor to the DNA

allosteric inhibition

the binding of RNA polymerase to the promoter

the binding of a repressor to the RNA polymerase

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Which of the following act as the blueprint or template for the process of protein synthesis that takes place on ribosomes?

DNA

rRNA

mRNA

tRNA

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The Shine-Dalgarno sequence is

a short sequence that acts as a ribosomal binding site

a stop codon

the reading frame of a gene

trailer sequence

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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

Three

Four

One

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