Nucleic Acids - Mock Test 42

Question 411

Nitrogen at position 1 of pyrimidine nucleus comes from?

A) Glutamine B) Glutamate C) Glycine D) Aspartate

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Question 412

The nitrogen atoms of pyrimidine nucleus are provided by?

A) Glutamate B) Glutamate and aspartate C) Glutamine D) Glutamine and aspartate

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Question 413

An enzyme common to de novo synthesis of pyrimidine nucleotides and urea is?

A) Urease B) Carbamoyl phosphate synthetase C) Aspartate transcarbamoylase D) Argininosuccinase

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Question 414

De novo synthesis of pyrimidine nucleotides occurs in?

A) Mitochondria B) Cytosol C) Microsomes D) Ribosomes

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Question 415

Dietary purines are catabolised in?

A) Liver B) Kidneys C) Intesitnal mucosa D) All of these

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Question 416

Uric acid is the end product of purine as well as protein catabolism in?

A) Man B) Fish C) Birds D) None of these

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Question 417

The enzyme common to catabolism of all the purines is?

A) Adenosine deaminase B) Purine nucleoside phosphorylase C) Guanase D) None of these

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Question 418

The end product of purine catabolism in man is?

A) Inosine B) Hypoxanthine C) Xanthine D) Uric acid

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Question 419

The available PRPP is used preferentially for?

A) De novo synthesis of purine nucleotides B) De novo synthesis of pyrimidine nucleotides C) Salvage of purine bases D) Salvage of pyrimidine bases

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Question 420

Salvage of purine bases is regulated by?

A) Adenosine phosphoribosyl transferase B) Hypoxanthine guanine phosphoribosyl transferase C) Availability of PRPP D) None of these

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