TRANSLATION AND REGULATION QUIZ

A quorum sensing system

senses a compound produced by the bacterium itself

detects a signal from the external environment

consists of a sensor component that phosphorylates a regulatory protein

controls the activity of ribosomes directly

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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 direct cause of cell death by diphtheria toxin?

Induction of apoptosis

Formation of an ion channel in the cell membrane

Inactivation of a translational elongation factor

None of these

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The development of global regulatory systems in prokaryotes

aids in DNA replication

determines the exact location of the cell on the globe

regulates many genes under varying environmental conditions

determines the exact location of the replication site

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Site in the ribosome from which the tRNA donates amino acids to the growing polypeptide chain is

T site

A site

O site

P site

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During amino acid activation a(n)

methyl group is attached to an amino acid

amino acid is bound to mRNA

methyl group is attached to rRNA

amino acid is bound to tRNA

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

CAU

AUG

AGU

CGA

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

40S and 20S

50S and 30S

50S and 20S

40S and 30S

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The interaction between the mRNA and tRNA determined the position of amino acid in a polypeptide sequence. This is called the

promiscuity

Wobble hypothesis

adaptor hypothesis

stagerivity

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

missense codons

antisense codons

pause codons

nonsense codons

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