In RNA thymine is replaced by

1. uracil                           

2. adenine

3. thiamine                       

4. guanine

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 92%
AIIMS - 2001
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The vitamin nicotinamide can be synthesized in our body from.

1. tyrosine

2. tryptophan

3. valinc

4. phenylalanine

Subtopic:  Enzymes |
AIIMS - 2002
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An example of the competitive inhibition of an enzyme is the inhibition of:

1. succinic dehydrogenase by malonic acid

2. cytochrome oxidase by cyanide

3. hexokinase by glucose -6-phosphate

4. carbonic anhydrase by carbondioxide

Subtopic:  Enzyme Inhibition: Introduction | Enzyme Inhibition |
 92%
From NCERT
AIIMS - 2003
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In which one of the following sets of three items each belong to the category mentioned against them?

(1) Lysine, glycine, thiamine - amino acids

(2) Myosin, oxytocin and gastrin -hormones

(3) Rennin, helicase and hyaluronidase - enzymes

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

Subtopic:  Enzymes Classification |
AIIMS - 2006
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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?

(1) a - normal enzyme reaction

     b - competitive inhibition

     c - non-competitive inhibition

(2) a - enzyme with an allosteric modulator added

     b - normal enzyme activity

     c - competitive inhibition

(3) a - enzyme with an allosteric stimulator

     b - competitive inhibition added

     c - normal enzyme reaction

(4) a - normal enzyme reaction

     b - non-competitive inhibitor added

     c - allosteric inhibitor added

Subtopic:  Properties of Enzymes |
AIIMS - 2006
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Which of the following contain β-1, 4 linkage?

(1) Maltose

(2) Sucrose

(3) Lactose

(4) Fructose

Subtopic:  Carbohydrates: Glycosidic Bond & Disaccharide |
AIIMS - 2007
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Enzymes, vitamins and hormones can be classified into a single category of biological chemicals because of all of these

(1) enhance oxidative metabolism

(2) are conjugated proteins

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

(4) help in regulating metabolism.

 53%
AIIMS - 2008
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Cut surfaces of fruit and vegetables often become dark because

(1) dirty knife makes it dark

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

(3) dust of the air makes it dark

(4) none of the above

Subtopic:  Element Analysis |
 91%
AIIMS - 2008
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Cotton fibres mainly contains

(1) cellulose           

(2) glycogen

(3) protein             

(4) lipid

Subtopic:  Carbohydrates: Cellulose, Chitin, Inulin & Agar |
 90%
From NCERT
AIIMS - 2009
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Which of the following sugars is not found in plants?

(1) Sucrose

(2) Glucose

(3) Lactose

(4) Fructose

Subtopic:  Carbohydrates: Introduction |
 79%
AIIMS - 2009
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