Q. No.Which one of the following statements is correct with reference to enzymes?
1. Holoenzyme= Apoenzyme+Coenzyme
2. Coenzyme= Apoenzyme+Holoenzyme
3. Holoenzyme= Coenzyme+ CO-factor
4. Apoenzyme=Holoenzyme+Coenzyme
The two functional groups characteristic of sugars are:
| 1. | Hydroxyl and methyl | 2. | Carbonyl and methyl |
| 3. | Carbonyl and phosphate | 4. | Carbonyl and hydroxyl |
| 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 |
1. Cellulose is a polysaccharide
2. Uracil is a pyrimidine
3. Glycine is a sulphur-containing amino acid
4. Sucrose is a disaccharide
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
| 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. |
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 |
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
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