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Q. No.An enzyme catalysed reaction is running optimally at 40oC. If the temperature is reduced to 20oC, the rate of reaction is expected to:
1. Double
2. Half
3. Increase four time
4. Reduce to a quarter
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
54%
Level 3: 35%-60%
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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 peroxidase |
Subtopic: Enzyme Cofactors |
85%
Level 1: 80%+
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Which biomolecule makes up maximum percent of the total cellular mass in an average cell?
1. Proteins
2. Carbohydrates
3. Lipids
4. Nucleic acids
1. Proteins
2. Carbohydrates
3. Lipids
4. Nucleic acids
Subtopic: Introduction |
81%
Level 1: 80%+
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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 |
87%
Level 1: 80%+
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All enzymes are:
| 1. | Proteins |
| 2. | Thermostable |
| 3. | Capable of speeding up a biochemical reaction |
| 4. | Capable of working in alkaline pH |
Subtopic: Enzymes | Factors Affecting Enzyme Catalysis Reaction |
62%
Level 2: 60%+
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A secondary metabolite, produced by castor oil plant, that is a highly potent toxin is:
1. Morphine
2. Concanavalin A
3. Ricin
4. Vinblastin
1. Morphine
2. Concanavalin A
3. Ricin
4. Vinblastin
Subtopic: Primary & Secondary Metabolites |
84%
Level 1: 80%+
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Which of the following amino acids is not an aromatic amino acid?
| 1. | Tyrosine | 2. | Tryptophan |
| 3. | Threonine | 4. | Phenylalanine |
Subtopic: Amino Acids |
85%
Level 1: 80%+
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The number and linear sequence of amino acids in a protein are considered as the:
1. primary structure of a protein
2. secondary structure of a protein
3. tertiary structure of a protein
4. quaternary structure of a protein
1. primary structure of a protein
2. secondary structure of a protein
3. tertiary structure of a protein
4. quaternary structure of a protein
Subtopic: Proteins |
91%
Level 1: 80%+
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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 |
88%
Level 1: 80%+
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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 |
79%
Level 2: 60%+
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