The vitamin Niacin functions as a coenzyme in:

1. Nucleoprotein synthesis

2. Hydrogen transport

3. Fatty acid synthesis

4. RBC production

Subtopic:  Enzyme Cofactors |
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The six most common atoms in organic molecules are:

1. Carbon, Hydrogen, Oxygen, Helium, Calcium and Sulphur
2. Carbon, Hydrogen, Oxygen, Calcium, Magnesium and Sulphur
3. Carbon, Oxygen, Nitrogen, Sulphur, Phosphorous and Magnesium
4. Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous and Sulphur
Subtopic:  Introduction |
 76%
From NCERT
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The unique properties of each amino acid are determined by its particular:

1. R group

2. Amino group

3. Kinds of peptide bonds

4. Number of bonds to other amino acids 

Subtopic:  Introduction to Proteins |
 88%
From NCERT
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Based on the graph of an enzyme-catalyzed reaction, which of the following could be used to increase the reaction rate beyond point C?

1. increase the amount of substrate

2. add more water

3. increase the temperature

4. decrease enzyme concentration

Subtopic:  Properties of Enzymes |
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Given below is the graph showing the effect of substrate concentration on enzyme activity. In the presence of a competitive inhibitor, when the concentration of the substrate is progressively increased:

 

1. The Km value is increased but the reaction will not achieve Vmax

2. The Km value is increased but the reaction can ultimately achieve Vmax

3. The Km value is decreased but the reaction will not achieve Vmax

4. The Km value is decreased but the reaction can ultimately achieve Vmax

Subtopic:  Enzyme Inhibition |
 61%
From NCERT
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Study the primary structure of a part of a hypothetical protein and choose the correct statements:

I. 1 is Serine

II. 2 is sulfur containing amino acid and can be methionine

III. 3 is aromatic amino acid and can by tyrosine

IV. 4 is an acidic amino acid

1. I, II and III only

2. I, III and IV only

3. II, III and IV only

4. I, II, III and IV

Subtopic:  Proteins |
From NCERT
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Which of the following biomolecules does have a phosphodiester bond?

(1) Fatty acids in a diglyceride

(2) Monosaccharides in a polysaccharide

(3) Amino acids in a polypeptide

(4) Nucleic acids in a nucleotide

Subtopic:  Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
 69%
From NCERT
NEET - 2015
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The chitinous exoskeleton of arthopods is formed by the polymerisation of 

(1) keratin sulphate and chondroitin sulphate

(2) D-glucosamine

(3) N-acetyl glucosamine

(4) lipoglycans

Subtopic:  Carbohydrates: Cellulose, Chitin, Inulin & Agar |
 83%
NEET - 2015
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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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