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

(1) Apoenzyme = Holoenzyme + Coenzyme

(2) Holoenzyme = Apoenzyme + Coenzyme

(3) Coenzyme = Apoenzyme + Holoenzyme

(4) Holoenzyme = Coenzyme + Cofactor

Subtopic:  Enzyme Cofactors |
 70%
From NCERT
NEET - 2017
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Which of the following is not a polymeric substance?

(1) Nucleic acid               

(2) Proteins

(3) Polysaccharides           

(4) Lipids

Subtopic:  Introduction |
 77%
From NCERT
NEET - 2017
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A non-proteinaceous enzyme is

(1) lysozyme           

(2) ribozyme

(3) ligase               

(4) deoxyribonuclease

Subtopic:  Enzyme Introduction |
 73%
From NCERT
NEET - 2016
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Which of the following is the least likely to be involved in stabilising the three-dimensional folding of most proteins?

(1) Hydrogen bonds

(2) Electrostatic interaction

(3) Hydrophobic interaction

(4) Ester bonds

 

Subtopic:  Structural Organisation of Proteins |
NEET - 2016
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Which of the following describes the graph correctly?

(1) Endothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme

(2) Exothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme

(3) Endothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme

(4) Exothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme

 

Subtopic:  Mechanism of Enzymes |
 75%
From NCERT
NEET - 2016
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Which one of the following statements is wrong?

(1) Cellulose is a polysachharide

(2) Uracil is a pyrimidine

(3) Glycine is a sulphur containing amino acid

(4) Sucrose is a diasaccharide

Subtopic:  Different Amino Acids |
 83%
From NCERT
NEET - 2016
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A typical fat molecule is made up of

(1) One glycerol and three fatty acid molecules

(2) One glycerol and one fatty acid molecule

(3) Three glycerol and three fatty acid molecules

(4) Three glycerol molecules and one fatty acid molecule

Subtopic:  Lipids: Fatty Acids |
 72%
NEET - 2016
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Which one of the following statement is incorrect ?

1. A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor.

2. In competitive inhibition the inhibitor molecule is not chemically changed by the

enzyme.

3. The competative inhibitor does not affect the rate of breakdown of the enzyme-

substrate complex.

4. The presence of the competitive inhibitor decreases the km of the enzyme for the

substrate.

Subtopic:  Enzyme Inhibition: Introduction | Enzyme Inhibition |
NEET - 2015
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A phosphoglyceride is always made up of

1. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group

is also attached

2. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate

group is also attached

3. a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a

phosphate group is also attached

4. a saturated or unsaturated fatty acid esterified to a phosphate group, which is also

attached to a glycerol molecule.

Subtopic:  Lipids: Glycerolipids, Phospholipids & Glycerol |
 57%
NEET - 2013
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The essential chemical components of many coenzymes are

1. Proteins

2. Nucleic acids

3. Carbohydrates

4. Vitamins

Subtopic:  Enzyme Cofactors |
 64%
From NCERT
NEET - 2013
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