In RNA thymine is replaced by

(a) uracil                           (b) adenine

(c) thiamine                       (d) guanine

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The vitamin nicotinamide can be synthesized in our body from.

(a) tyrosine
(b) tryptophan
(c) valinc
(d) phenylalanine

Concept Questions :-

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An example of the competitive inhibition of an enzyme is the inhibition of:

(a) succinic dehydrogenase by malonic acid

(b) cytochrome oxidase by cyanide

(c) hexokinase by glucose -6-phosphate

(d) carbonic anhydrase by carbondioxide

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In which one of the following sets of three items each belong to the category mentioned against them?

(a) Lysine, glycine, thiamine - amino acids

(b) Myosin, oxytocin and gastrin -hormones

(c) Rennin, helicase and hyaluronidase - enzymes

(d) Optic nerve, oculomotor, vagus - sensory nerves

Concept Questions :-

Enzymes Classification
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The figure given below shows three velocity substrate concentration curves for an enzyme reaction. What do the curves a, b,  and c depict respectively?

(a) a - normal enzyme reaction

     b - competitive inhibition

     c - non-competitive inhibition

(b) a - enzyme with an allosteric modulator added

     b - normal enzyme activity

     c - competitive inhibition

(c) a - enzyme with an allosteric stimulator

     b - competitive inhibition added

     c - normal enzyme reaction

(d) a - normal enzyme reaction

     b - non-competitive inhibitor added

     c - allosteric inhibitor added

Concept Questions :-

Factors Affecting Enzyme Catalysis Reaction
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Which of the following contain β-1, 4 linkage?

(a) Maltose

(b) Sucrose

(c) Lactose

(d) Fructose

Concept Questions :-

Carbohydrates
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Which statement is true?

(a) Adenine has 4 nitrogen atoms

(b) Cytosine has 3 nitrogen atoms

(c) Guanosine has 3 nitrogen atoms

(d) Uracil has 5 nitrogen atoms

Concept Questions :-

Nucleic Acid
Please attempt this question first.

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Enzymes, vitamins and hormones can be classified into a single category of biological chemicals because of all of these

(a) enhance oxidative metabolism

(b) are conjugated proteins

(c) arc exclusively synthesised in the body of a living organism as at present

(d) help in regulating metabolism.

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Cut surfaces of fruit and vegetables often become dark because

(a) dirty knife makes it dark

(b) oxidation of tannic acid in the presence of a trace of iron from the knife makes it dark

(c) dust of the air makes it dark

(d) none of the above

Concept Questions :-

Element Analysis
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Cotton fibres mainly contains

(a) cellulose            (b) glycogen

(c) protein              (d) lipid

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