Q. No.What level of protein organization structure explains the 3-D shape of an enzyme?
1.
primary structure
2.
tertiary structure
3.
secondary structure
4.
quaternary structure
| 1. | primary structure |
| 2. | tertiary structure |
| 3. | secondary structure |
| 4. | quaternary structure |
The rate of enzyme action decreases at higher temperature [after a certain value] because the increased heat
| 1. | changes the pH of the system |
| 2. | alters the active site of the enzyme |
| 3. | neutralizes the acids and bases in the system |
| 4. | increases the concentration of the enzyme |
In the formation of a macromolecule, what type of reaction would join two subunits together?
| 1. | hydrophobic reaction | 2. | hydrolysis reaction |
| 3. | dehydration reaction | 4. | denaturation reaction |
During catalytic cycle of an enzyme–
| 1. | Enzyme alter its shape to fit the substrate molecule. |
| 2. | Substrate alter its shape to get fit into the enzyme molecule. |
| 3. | Both enzyme and substrate changes its shape during transition state. |
| 4. | Enzyme and substrate are rigid molecular structure and it never changes its shape. |
How many statements are false from given information?
| (a) | Ribozymes are enzyme made up of protein. |
| (b) | In every chemical reaction transition state energy is always greater than activation energy. |
| (c) | Co-factors are always proteinous in nature |
| (d) | Enzyme inhibition can not be removed. |
| (e) | Enzyme action can be stopped at low temp. |
| (f) | Km value (Michaelis constant) is the specific concentration of substrate molecule. |
1. 2
2. 3
3. 4
4. 5
Select the option which is incorrect for enzyme catalase.
| 1. | The cofactor present is inorganic and proteinaceous in nature |
| 2. | Haem is the prosthetic group required by the enzyme |
| 3. | The cofactor required for optimal activity must be tightly bound to the apoenzyme |
| 4. | It catalyses breakdown of hydrogen peroxide to water and oxygen |
Select the correct statement
| 1. | The base pairs in DNA are stacked 0.34 nm apart |
| 2. | The diameter of a right handed helical ds B-DNA molecules is 34 |
| 3. | Sugar-phosphate and hydrogen bonds are both present in a single nucleotide such as AMP |
| 4. | A and T of one strand compulsorily base pair with G and C respectively, of other strand is DNA |
1. increasing the amount of substrate
2. adding more water
3. increasing the temperature
4. decreasing enzyme concentration
An example of protein with quaternary structure is
1. Myoglobin
2. Hemoglobin
3. Keratin
4. All of these
Enzymes catalyse biochemical reactions by
1. Lowering the activation energy
2. Increasing the activation energy
3. Establishing stable bonds with substrate
4. Increasing temperature
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