Q. No.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
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 polypeptide
4. Nucleic acids in a nucleotide
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. |
Select the option which is not correct with respect to enzyme action:
| 1. | Substrate binds with the enzyme at its active site. |
| 2. | Addition of a 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 |
Which one of the following is a non-reducing carbohydrate?
1. Maltose
2. Sucrose
3. Lactose
4. Ribose 5-phosphate
| 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 is esterified to a glycerol molecule to which a phosphate group is also attached. |
The essential chemical components of many coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins
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
Macro molecule chitin is:
1. Phosphorus containing saccharide
2. Sulphur containing polysaccharide
3. Simple polysaccharide
4. Nitrogen-containing polysaccharide
| 1. | Tissue (X) secretes RNA which changes the development of tissue (Y) |
| 2. | As tissue (X) develops, it secretes enzymes that inhibit the development of tissue (Y) |
| 3. | As tissue (X) develops, it secretes something that induces tissue (Y) to develop |
| 4. | As tissues (X) develops, it secretes something that shows down the growth of tissue (Y) |
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