The chitinous exoskeleton of arthropods is formed by the polymerization of

1. Keratine sulphate and chondroitin sulphate

2. D-glucosamine

3. N-acetyl glucosamine

4. Lipoglycans

Subtopic:  Carbohydrates: Cellulose, Chitin, Inulin & Agar |
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Which of the following biomolecules have a phosphodiester bond?

1. Fatty acids in a diglyceride

2. Monosaccharides in a polysaccharide

3. Amino acids in a plypeptide

4. Nucleic acids in a nucleoide

Subtopic:  The DNA |
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Which one of the following statements 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 competitive 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 |
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Select the option which is not correct with respect to enzyme action:

1. Substrate binds with enzyme at its active site.

2. Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate

3. A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate 

4. malonate is a competitive inhibitor of succinic dehydrogenase

Subtopic:  Enzyme Inhibition: Introduction |
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Which one of the following is a non-reducing carbohydrate?

1. Maltose

2. Sucrose

3. Lactose

4. Ribose 5-phospohate

Subtopic:  Carbohydrates |
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A phosphoglyceride is always made up of
1. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
2. a saturated or 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 phosphate group which is also attached to a glycerol molecule.
4. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
Subtopic:  Lipids: Glycerolipids, Phospholipids & Glycerol |
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The essential chemical components of many coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins

Subtopic:  Enzyme Cofactors |
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Transition state structure of the substrate formed during an enzymatic reaction is:
1. permanent but unstable
2. transient and unstable
3. permanent and stable
4. transient but stable

Subtopic:  Mechanism of Enzymes |
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Macro molecule chitin is:

1. Phosphorus containing sachharide

2. Sulphur containing polysachharide

3. Simple polysachharide

4. Nitrogen containing polysachharide

Subtopic:  Carbohydrates: Cellulose, Chitin, Inulin & Agar |
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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 :
     

1. Category: Cholesterol; Component: Guanine
2. Category: Amino acid; Component: NH2
3. Category: Nucleotide; Component: Adenine
4. Category: Nucleoside; Component: Uracil

Subtopic:  Nucleic Acid: Nucleotides | Double Helix : Watson & Crick Part 1 | Double Helix : Watson & Crick |
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