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Q. No.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: Enzyme Catalysis |
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Regarding various levels of protein structure, which of the following is not true?
| 1. | The positional information of amino acids in a protein is called the primary structure. |
| 2. | Alpha helix is a secondary structure and beta pleated sheet is a tertiary structure of a protein. |
| 3. | Tertiary structure is absolutely necessary for the many biological activities of proteins. |
| 4. | Quaternary structures are seen in proteins made of more than one polypeptide chain. |
Subtopic: Proteins |
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Identify the incorrectly matched pair:
| 1. | Aromatic amino acid | Tryptophan |
| 2. | Basic amino acid | Arginine |
| 3. | Initiator amino acid | Phenylalanine |
| 4. | Simplest amino acid | Alanine |
Subtopic: Different Amino Acids |
56%
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Regarding enzyme catalysis, all of the following will be true except:
| 1. | The rate of reaction initially increases with an increase in substrate concentration |
| 2. | It speeds up the rate of reaction by decreasing the requirement for activation energy |
| 3. | If the associated co-factor is removed, the enzyme activity is enhanced |
| 4. | Enzymes have an optimum temperature and pH at which they act most efficiently |
Subtopic: Enzyme Catalysis |
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Identify the incorrectly match pair:
| 1. | RuBisCO | Most abundant protein in the whole of the biosphere |
| 2. | Insulin | A polymer of fructose |
| 3. | Vinblastin | A secondary metabolite used as a drug |
| 4. | Adenine | A substituted purine |
Subtopic: Proteins | Primary & Secondary Metabolites |
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Identify the correct statement:
| 1. | α amino acids are substituted methanes |
| 2. | Only triglycerides are lipids that are both macromolecules as well as polymers |
| 3. | Cellulose forms secondary helical structures and can hold iodine molecules in the helical portion |
| 4. | Every virus will have both DNA and RNA as its genetic material |
Subtopic: Amino Acids |
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Regarding factors affecting enzyme activity:
| I: | Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity. |
| II: | With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
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The number of:
| 1. | Aromatic proteinogenic amino acids is 5 |
| 2. | Carbon atoms in arachidonic acid including carboxyl carbon is 20 |
| 3. | Fatty acids in cholesterol is 3 |
| 4. | Polypeptide chains in quaternary structure of haemoglobin is 2 |
Subtopic: Lipids: Glycerolipids, Phospholipids & Glycerol |
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Identify the incorrect statement:
| 1. | Zinc is a cofactor for carboxypeptidase |
| 2. | NADP contains the vitamin cyanocobalamin |
| 3. | Malonate is a competitive inhibitor of Succinic dehydrogenase |
| 4. | Haem is the prosthetic group in peroxidise |
Subtopic: Enzyme Cofactors |
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