Nucleic Acids - Mock Test 28

Question 271

Erythromycin binds to 50 S ribosomal sub unit and?

A) Inhibits binding of amino acyl tRNA B) Inhibits Peptidyl transferase activity C) Inhibits translocation D) Causes premature chain termination

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Question 272

Peptidyl transferase activity of 50 S ribosomal subunits is inhibited by?

A) Rifampicin B) Cycloheximide C) Chloramphenicol D) Erythromycin

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Question 273

Tetracyclines inhibit binding of amino acyl tRNAs to?

A) 30 S ribosomal subunits B) 40 S ribosomal subunits C) 50 S ribosomal subunits D) 60 S ribosomal subunits

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Question 274

Binding of formylmehtionyl tRNA to 30 S ribosomal subunit of prokaryotes is inhibited by?

A) Streptomycin B) Chloramphenicol C) Erythromycin D) Mitomycin

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Question 275

After formation of a peptide bond, mRNA is translocated along the ribosome by?

A) eEF-1 and GTP B) eEF-2 and GTP C) Peptidyl transferase and GTP D) Peptidyl transferase and ATP

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Question 276

Peptidyl transferase activity is present in?

A) 40 S ribosomal subunit B) 60 S ribosomal subunit C) eEF-2 D) Amino acyl tRNA

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Question 277

eIF-4 B?

A) Binds to 3’ chain initiation codon on mRNA B) Binds to 3’ end of mRNA C) Binds to 5’ end of mRNA D) Unwinds mRNA near its 5’ end

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Question 278

eIF-4 A possesses?

A) ATPase activity B) GTPase activity C) Helicase activity D) None of these

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Question 279

eIF-1A and eIF-3 are required?

A) For binding of amino acyl tRNA to 40 S ribosomal subunit B) For binding of mRNA to 40 S ribosomal subunit C) For binding of 60 S subunit to 40 S subunit D) To prevent binding of 60 S subunit to 40 S subunit

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Question 280

The first amino acyl tRNA approaches 40 S ribosomal subunit in association with?

A) eIF-1A and GTP B) eIF-2 and GTP C) eIF-2C and GTP D) eIF-3 and GTP

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