Biology - Comprehensive Mock Test 54

Question 531 Medium

One strand of DNA has the following sequence of nucleotide 3’ ATTCGCTAT 5’ so the other strand of DNA has ?

A) 5’ TAAGCGATA 3’ B) 3’ TAAGCGATA 5’ C) 5’ GACGCGATA 3’ D) 3’ GACGCGATA 5’

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Question 532 Medium

The ‘‘lock and key’’ model of enzyme action illustrates that a particular enzyme molecule ?

A) May be destroyed and resynthesised several times B) Interacts with a specific type of substrate molecule C) Reacts at identical rates under all conditions D) Forms a permanent enzyme-substrate complex

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Question 533 Medium

Which one of the following statements is true with reference to enzymes?

A) Apoenzyme = Holoenzyme + Coenzyme B) Holoenzyme = Apoenzyme + Coenzyme C) Coenzyme = Apoenzyme + Holoenzyme D) Holoenzyme = Coenzyme – Apoenzyme

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Question 534 Medium

Which one of the following pairs is wrongly matched?

A) Textile - amylase B) Detergents - lipase C) Alcohol - nitrogenase D) Fruit juice - pectinase

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Question 535 Medium

Which one of the following is resistant to enzyme action?

A) Leaf cuticle B) Cork C) Wood fibre D) Pollen exine

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Question 536 Easy

Turn over number of an enzyme is dependent upon ?

A) Size of enzyme B) Molecular weight of enzyme C) Active sites D) Concentration of substrate

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Question 537 Medium

The polypeptide or protein part of the enzyme is called ?

A) Apoenzyme B) Holoenzyme C) Prosthetic group D) Zymogen

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Question 538 Easy

The non protein part of an enzyme is known as ?

A) Holoenzyme B) Vitamin C) Apoenzyme D) Prosthetic group

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Question 539 Hard

The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in the leguminous root nodule is ?

A) nitrogenase B) nitrate reductase C) nitrite reductase D) all of the above

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Question 540 Medium

The activity of succinate dehydrogenase is inhibited by ?

A) Glycolate B) Pyruvate C) Malonate D) Phosphoglycerate

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