Nucleic Acids - Mock Test 48

Question 471

Defective enzyme in Hurler’s syndrome is?

A) α-L-diuronidase B) Iduronate sulphatase C) Arylsulphatase B D) C-acetyl transferase

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Question 472

Ultraviolet light can damage a DNA strand causing?

A) Two adjacent purine residue to form a covalently bounded dimer B) Two adjacent pyrimidine residues to form covalently bonded dimer C) Disruption of phosphodiesterase linkage D) Disruption of non-covalent linkage

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Question 473

Peptidyl transferase activity is located in?

A) Elongation factor B) A charged tRNA molecule C) Ribosomal protein D) A soluble cytosolic protein

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Question 474

A tetrovirus is?

A) Polio virus B) HIV C) Herpes virus D) Tobacco mosaic virus

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Question 475

Reverse transcriptase is capable of synthesising?

A) RNA → DNA B) DNA → RNA C) RNA → RNA D) DNA → DNA

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Question 476

The region of DNA known as TATA BOX is the site for binding of?

A) DNA polymerase B) DNA topoisomerase C) DNA dependent RNA polymerase D) Polynucleotide phosphorylase

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Question 477

Okazaki fragment is related to?

A) DNA synthesis B) Protein synthesis C) mRNA formation D) tRNA formation

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Question 478

Repressor binds to DNA sequence and regulate the transcription. This sequence is called?

A) Attenuator B) Terminator C) Anti terminator D) Operator

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Question 479

Interferon?

A) Is virus specific B) Is a bacterial product C) Is a synthetic antiviral agent D) Requires expression of cellular genes

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Question 480

Positive control of induction is best described as a control system in which an operon functions?

A) Unless it is switched off by a derepressed repressor protein B) Only after a repressor protein is inactivated by an inducer C) Only after an inducer protein, which can be inactivated by a corepressor, switches it on D) Only after an inducer protein, which is activated by an inducer, switch it on

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