The essential chemical components of many coenzymes are:
1. | Nucleic acid | 2. | Carbohydrates |
3. | Vitamins | 4. | Proteins |
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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 |
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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. |
1. | Aromatic amino acid | Tryptophan |
2. | Basic amino acid | Arginine |
3. | Initiator amino acid | Phenylalanine |
4. | Simplest amino acid | Alanine |
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 |
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 |
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 |
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 |
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 |
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 peroxidase |