Macromolecule chitin is

1. nitrogen containing polysaccharide.

2. phosphorus containing polysaccharide

3. sulphur containing polysaccharide

4. simple polysaccharide

Given below is the diagrammatic representation of one of the categories of small

molecular weight organic compounds in the living tissues. Identify the category shown

and the one blank component X in it

Category              Component

1. Cholesterol       Guanin

2. Amino acid       NH₂

3. Nucleotide        Adenine

4. Nucleoside       Uracil

Which one is the most abundant protein in the animal world?

1. Trypsin                     

2. Haemoglobin

3. Collagen                   

4. Insulin

Which one of the following structural formulae of two organic compounds is correctly

identified with its related function?

1. A - triglyceride major - a source of energy

2. A - Lecithin - a component of cell membrane 

3. B - Adenine - forms nucleotides of the nucleic acids

4. Both 2. and 3.

Which one of the following pairs is wrongly matched?

1. Detergents - Lipase

2. Alcohol - Nitrogenase

3. Fruit juice - Pectinase

4. Textile - Amylase

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched

with the category mentioned against it?

1. Thymine, Uracil         - Pyrimidines

2. Uracil, Cytosine         - Pyrimidines

3. Guanine, Adenine      - Purines

4. Adenine, Thymine     - Purines

A competive inhibitor of succinic dehydrogenase is

1. malonate                 

2. oxaloacetate

3. $\mathrm{\alpha }$-ketoglutarate       

4. malate

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.

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 k_m of the enzyme for the

substrate.

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