Nucleic Acids - Mock Test 29

Question 281

The codon which serves as translation start signal is?

A) AUG B) UAG C) UGA D) UAA

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Question 282

Eukaryotic initiation factors 4A, 4B and 4F bind to?

A) 40 S ribosomal subunit B) 60 S ribosomal subunit C) mRNA D) Amino acyl tRNA

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Question 283

In eukaryotes, the 40 S pre-initiation complex contains all the following initiation factors except?

A) eIF-1A B) eIF-2 C) eIF-3 D) eIF-4

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Question 284

The first amino acyl tRNA which initiates translation in prokaryotes is?

A) Mehtionyl tRNA B) Formylmethionyl tRNA C) Tyrosinyl tRNA D) Alanyl tRNA

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Question 285

The first amino acyl tRNA which initiates translation in eukaryotes is?

A) Mehtionyl tRNA B) Formylmethionyl tRNA C) Tyrosinyl tRNA D) Alanyl tRNA

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Question 286

All the following statements about recognition of a codon on mRNA by an anticodon on tRNA are correct except?

A) The recognition of the third base of the codon is not very precise B) Imprecise recognition of the third base results in wobble C) Wobble is partly responsible for the degeneracy of the genetic code D) Wobble results in incorporation of incorrect amino acids in the protein

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Question 287

All the following statements about charging of tRNA are correct except?

A) It is catalysed by amino acyl tRNA synthetase B) ATP is converted into ADP and Pi in this reaction C) The enzyme recognizes the tRNA and the amino acid D) There is a separate enzyme for each tRNA

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Question 288

All the following statements about tRNA are correct except?

A) A given tRNA can be charged with only one particular amino acid B) The amino acid is recognized by the anticodon of tRNA C) The amino acid is attached to end of tRNA D) The anticodon of tRNA finds the complementary codon on mRNA

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Question 289

Eukaryotic promoters contain?

A) TATA box 25bp upstream of transcription start site B) CAAT box 70-80 bp upstream of transcription start site C) Both A and B D) None of these

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Question 290

CAAT box is present in?

A) Prokaryotic promoters 10 bp upstream of transcription start site B) Prokaryotic promoters 35 bp upstream of transcription start site C) Eukaryotic promoters 25 bp upstream of transcription start site D) Eukaryotic promoters 70–80 bp upstream of transcription start site

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