Nucleic Acids - Mock Test 52

Question 511

5’-Terminus of mRNA molecule is capped with?

A) Guanosine triphosphate B) 7-Methylguanosine triphophate C) Adenosine triphosphate D) Adenosine diphosphate

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Question 512

The function of a repressor protein in an operon system is to prevent synthesis by binding to?

A) The ribosome B) A specific region of the operon preventing transcription of structural genes C) The RNA polymerase D) A specific region of the mRNA preventing translation to protein

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Question 513

The correct statement concerning RNA and DNA polymerases is?

A) RNA polymerase use nucleoside diphosphates B) RNA polymerase require primers and add bases at 5’ end of the growing polynucleotide chain C) DNA polymerases can add nucleotides at both ends of the chain D) All RNA and DNA polymerases can add nucleotides only at the 3’ end of the growing polynucleotide chain

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Question 514

The correct statement concerning RNA and DNA polymerases is?

A) RNA polymerase use nucleoside diphosphates B) RNA polymerase require primers and add bases at 5’ end of the growing polynucleotide chain C) DNA polymerases can add nucleotides at both ends of the chain D) All RNA and DNA polymerases can add nucleotides only at the 3’ end of the growing polynucleotide chain

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Question 515

In the process of transcription in bacterial cells?

A) Initiation requires rho protein B) RNA polymerase incorporates methylated bases in correct sequence C) Both the sigma unit and core enzymes of RNA polymerase are required for accurate promotor site binding D) Primase is necessary for initiation

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Question 516

The smallest unit of DNA capable of coding for the synthesis of a polypeptide is?

A) Operon B) Repressor gene C) Cistron D) Replicon

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Question 517

In DNA replication the enzyme required in the first step is?

A) DNA directed polymerase B) Unwinding proteins C) DNA polymerase D) DNA ligase

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Question 518

mRNA is complementary to the nucleotide sequence of?

A) Coding strand B) Ribosomal RNA C) tRNA D) Template strand

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Question 519

Degeneracy of genetic code implies that?

A) Codons do not code for specific amino acid B) Multiple codons must decode the same amino acids C) No anticodon on tRNA molecule D) Specific codon decodes many amino acids

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Question 520

Genetic code is?

A) Collection of codon B) Collection of amino acids C) Collection of purine nucleotide D) Collection of pyrimidine nucleotide

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