277998
The effectiveness of an enzyme is affected least by
1 temperature.
2 concentration of the substrate.
3 original activation energy of the system.
4 concentration of the enzyme.
Explanation:
(c) The effectiveness of an enzyme is affected least by the original activation energy of the system. Because activation energy is the least amount of energy required to start chemical reaction.
NCERT Page-157
BIOMOLECULES(NCERT)
277999
What will happen when the cofactor is removed from the enzyme?
1 Catalytic activity of the enzyme is lost.
2 Enzyme preserves in a temporarily inactive state.
3 The substurate molecules are not closely related to enzymes molecules.
4 Both (b) and (c)
Explanation:
(a) When the cofactor is removed from the enzyme, catalytic activity of the enzyme is lost. Cofactors were defined as an additional substance apart from protein and substrate that is required for enzyme activity.
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
278000
Enzymes enhance the rate of reaction by
1 forming a reactant-product complex
2 changing the equilibrium point of the reaction
3 combining with the product as soon as it is formed
4 lowering the activation energy of the reaction
Explanation:
(d) Activation energy is the energy required to overcome energy barrier of the reactants and make them reactive to start a chemical reaction. Enzymes lower the requirement of activation energy.
Fig.: Concept of activation energy
NCERT Page-156 / N-114
BIOMOLECULES(NCERT)
278001
Select the option which is not correct with respect to enzyme action:
1 Substrate binds with enzyme at its active site.
2 Addition of 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.
Explanation:
(b) Inhibitions of succinic dehydrogenase by malonate is an example of competitive inhibition. Thus it is a reversible reaction. On increasing the substrate (succinate) concentration the effect of inhibitor is removed and ${{V}_{\text{max }\!\!~\!\!\text{ }}}$ remains same.
277998
The effectiveness of an enzyme is affected least by
1 temperature.
2 concentration of the substrate.
3 original activation energy of the system.
4 concentration of the enzyme.
Explanation:
(c) The effectiveness of an enzyme is affected least by the original activation energy of the system. Because activation energy is the least amount of energy required to start chemical reaction.
NCERT Page-157
BIOMOLECULES(NCERT)
277999
What will happen when the cofactor is removed from the enzyme?
1 Catalytic activity of the enzyme is lost.
2 Enzyme preserves in a temporarily inactive state.
3 The substurate molecules are not closely related to enzymes molecules.
4 Both (b) and (c)
Explanation:
(a) When the cofactor is removed from the enzyme, catalytic activity of the enzyme is lost. Cofactors were defined as an additional substance apart from protein and substrate that is required for enzyme activity.
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
278000
Enzymes enhance the rate of reaction by
1 forming a reactant-product complex
2 changing the equilibrium point of the reaction
3 combining with the product as soon as it is formed
4 lowering the activation energy of the reaction
Explanation:
(d) Activation energy is the energy required to overcome energy barrier of the reactants and make them reactive to start a chemical reaction. Enzymes lower the requirement of activation energy.
Fig.: Concept of activation energy
NCERT Page-156 / N-114
BIOMOLECULES(NCERT)
278001
Select the option which is not correct with respect to enzyme action:
1 Substrate binds with enzyme at its active site.
2 Addition of 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.
Explanation:
(b) Inhibitions of succinic dehydrogenase by malonate is an example of competitive inhibition. Thus it is a reversible reaction. On increasing the substrate (succinate) concentration the effect of inhibitor is removed and ${{V}_{\text{max }\!\!~\!\!\text{ }}}$ remains same.
277998
The effectiveness of an enzyme is affected least by
1 temperature.
2 concentration of the substrate.
3 original activation energy of the system.
4 concentration of the enzyme.
Explanation:
(c) The effectiveness of an enzyme is affected least by the original activation energy of the system. Because activation energy is the least amount of energy required to start chemical reaction.
NCERT Page-157
BIOMOLECULES(NCERT)
277999
What will happen when the cofactor is removed from the enzyme?
1 Catalytic activity of the enzyme is lost.
2 Enzyme preserves in a temporarily inactive state.
3 The substurate molecules are not closely related to enzymes molecules.
4 Both (b) and (c)
Explanation:
(a) When the cofactor is removed from the enzyme, catalytic activity of the enzyme is lost. Cofactors were defined as an additional substance apart from protein and substrate that is required for enzyme activity.
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
278000
Enzymes enhance the rate of reaction by
1 forming a reactant-product complex
2 changing the equilibrium point of the reaction
3 combining with the product as soon as it is formed
4 lowering the activation energy of the reaction
Explanation:
(d) Activation energy is the energy required to overcome energy barrier of the reactants and make them reactive to start a chemical reaction. Enzymes lower the requirement of activation energy.
Fig.: Concept of activation energy
NCERT Page-156 / N-114
BIOMOLECULES(NCERT)
278001
Select the option which is not correct with respect to enzyme action:
1 Substrate binds with enzyme at its active site.
2 Addition of 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.
Explanation:
(b) Inhibitions of succinic dehydrogenase by malonate is an example of competitive inhibition. Thus it is a reversible reaction. On increasing the substrate (succinate) concentration the effect of inhibitor is removed and ${{V}_{\text{max }\!\!~\!\!\text{ }}}$ remains same.
277998
The effectiveness of an enzyme is affected least by
1 temperature.
2 concentration of the substrate.
3 original activation energy of the system.
4 concentration of the enzyme.
Explanation:
(c) The effectiveness of an enzyme is affected least by the original activation energy of the system. Because activation energy is the least amount of energy required to start chemical reaction.
NCERT Page-157
BIOMOLECULES(NCERT)
277999
What will happen when the cofactor is removed from the enzyme?
1 Catalytic activity of the enzyme is lost.
2 Enzyme preserves in a temporarily inactive state.
3 The substurate molecules are not closely related to enzymes molecules.
4 Both (b) and (c)
Explanation:
(a) When the cofactor is removed from the enzyme, catalytic activity of the enzyme is lost. Cofactors were defined as an additional substance apart from protein and substrate that is required for enzyme activity.
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
278000
Enzymes enhance the rate of reaction by
1 forming a reactant-product complex
2 changing the equilibrium point of the reaction
3 combining with the product as soon as it is formed
4 lowering the activation energy of the reaction
Explanation:
(d) Activation energy is the energy required to overcome energy barrier of the reactants and make them reactive to start a chemical reaction. Enzymes lower the requirement of activation energy.
Fig.: Concept of activation energy
NCERT Page-156 / N-114
BIOMOLECULES(NCERT)
278001
Select the option which is not correct with respect to enzyme action:
1 Substrate binds with enzyme at its active site.
2 Addition of 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.
Explanation:
(b) Inhibitions of succinic dehydrogenase by malonate is an example of competitive inhibition. Thus it is a reversible reaction. On increasing the substrate (succinate) concentration the effect of inhibitor is removed and ${{V}_{\text{max }\!\!~\!\!\text{ }}}$ remains same.
