277993
Which of the following statements about enzymes is incorrect?
1 Enzymes are denatured at high temperature but in certain exceptional organisms. They are effective even at ${{80}^{\circ }}-{{90}^{\circ }}\text{C}$.
2 Enzymes require optimum $\text{pH}$ for maximal activity.
3 Most enzymes are proteins but some are lipids.
4 Enzymes are highly specific.
Explanation:
(c) Almost all enzymes are proteins. Certain RNAs have also been reported to have enzyme property. They are called ribozymes or RNA enzymes. No enzyme exists which is made up of lipid.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277994
Which of the following is not an attribute of enzymes ?
1 They are substrate specific in nature.
2 They are proteinaceous in nature.
3 They are used up in the reaction.
4 They speed up rate of biochemical reaction.
Explanation:
(c) Enzymes increase the rate of reaction without being consumed in the reaction.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277995
"All enzymes are proteins." This statement is now modified because an apparent exception to this biological truth is
1 arylsulfatase
2 dehydrogenase
3 ribozyme
4 nitroreductase
Explanation:
(c) All enzymes are proteinaceous in nature. This statement is now modified due to exception of ribozyme. Ribozymes are RNA molecules which catalyses specific biochemical reactions.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277996
Apoenzyme is
1 protein
2 carbohydrate
3 vitamin
4 amino acid
Explanation:
(a) Enzymes are profeinaceous molecules. Simple enzymes are composed of only protein, while holoenzymes are composed of protein part (apoenzyme) and non-protein part (prosthetic group).
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
277997
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.
Explanation:
(b) Transition state structure formed during an enzymatic reaction is transient and unstable.
277993
Which of the following statements about enzymes is incorrect?
1 Enzymes are denatured at high temperature but in certain exceptional organisms. They are effective even at ${{80}^{\circ }}-{{90}^{\circ }}\text{C}$.
2 Enzymes require optimum $\text{pH}$ for maximal activity.
3 Most enzymes are proteins but some are lipids.
4 Enzymes are highly specific.
Explanation:
(c) Almost all enzymes are proteins. Certain RNAs have also been reported to have enzyme property. They are called ribozymes or RNA enzymes. No enzyme exists which is made up of lipid.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277994
Which of the following is not an attribute of enzymes ?
1 They are substrate specific in nature.
2 They are proteinaceous in nature.
3 They are used up in the reaction.
4 They speed up rate of biochemical reaction.
Explanation:
(c) Enzymes increase the rate of reaction without being consumed in the reaction.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277995
"All enzymes are proteins." This statement is now modified because an apparent exception to this biological truth is
1 arylsulfatase
2 dehydrogenase
3 ribozyme
4 nitroreductase
Explanation:
(c) All enzymes are proteinaceous in nature. This statement is now modified due to exception of ribozyme. Ribozymes are RNA molecules which catalyses specific biochemical reactions.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277996
Apoenzyme is
1 protein
2 carbohydrate
3 vitamin
4 amino acid
Explanation:
(a) Enzymes are profeinaceous molecules. Simple enzymes are composed of only protein, while holoenzymes are composed of protein part (apoenzyme) and non-protein part (prosthetic group).
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
277997
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.
Explanation:
(b) Transition state structure formed during an enzymatic reaction is transient and unstable.
277993
Which of the following statements about enzymes is incorrect?
1 Enzymes are denatured at high temperature but in certain exceptional organisms. They are effective even at ${{80}^{\circ }}-{{90}^{\circ }}\text{C}$.
2 Enzymes require optimum $\text{pH}$ for maximal activity.
3 Most enzymes are proteins but some are lipids.
4 Enzymes are highly specific.
Explanation:
(c) Almost all enzymes are proteins. Certain RNAs have also been reported to have enzyme property. They are called ribozymes or RNA enzymes. No enzyme exists which is made up of lipid.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277994
Which of the following is not an attribute of enzymes ?
1 They are substrate specific in nature.
2 They are proteinaceous in nature.
3 They are used up in the reaction.
4 They speed up rate of biochemical reaction.
Explanation:
(c) Enzymes increase the rate of reaction without being consumed in the reaction.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277995
"All enzymes are proteins." This statement is now modified because an apparent exception to this biological truth is
1 arylsulfatase
2 dehydrogenase
3 ribozyme
4 nitroreductase
Explanation:
(c) All enzymes are proteinaceous in nature. This statement is now modified due to exception of ribozyme. Ribozymes are RNA molecules which catalyses specific biochemical reactions.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277996
Apoenzyme is
1 protein
2 carbohydrate
3 vitamin
4 amino acid
Explanation:
(a) Enzymes are profeinaceous molecules. Simple enzymes are composed of only protein, while holoenzymes are composed of protein part (apoenzyme) and non-protein part (prosthetic group).
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
277997
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.
Explanation:
(b) Transition state structure formed during an enzymatic reaction is transient and unstable.
277993
Which of the following statements about enzymes is incorrect?
1 Enzymes are denatured at high temperature but in certain exceptional organisms. They are effective even at ${{80}^{\circ }}-{{90}^{\circ }}\text{C}$.
2 Enzymes require optimum $\text{pH}$ for maximal activity.
3 Most enzymes are proteins but some are lipids.
4 Enzymes are highly specific.
Explanation:
(c) Almost all enzymes are proteins. Certain RNAs have also been reported to have enzyme property. They are called ribozymes or RNA enzymes. No enzyme exists which is made up of lipid.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277994
Which of the following is not an attribute of enzymes ?
1 They are substrate specific in nature.
2 They are proteinaceous in nature.
3 They are used up in the reaction.
4 They speed up rate of biochemical reaction.
Explanation:
(c) Enzymes increase the rate of reaction without being consumed in the reaction.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277995
"All enzymes are proteins." This statement is now modified because an apparent exception to this biological truth is
1 arylsulfatase
2 dehydrogenase
3 ribozyme
4 nitroreductase
Explanation:
(c) All enzymes are proteinaceous in nature. This statement is now modified due to exception of ribozyme. Ribozymes are RNA molecules which catalyses specific biochemical reactions.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277996
Apoenzyme is
1 protein
2 carbohydrate
3 vitamin
4 amino acid
Explanation:
(a) Enzymes are profeinaceous molecules. Simple enzymes are composed of only protein, while holoenzymes are composed of protein part (apoenzyme) and non-protein part (prosthetic group).
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
277997
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.
Explanation:
(b) Transition state structure formed during an enzymatic reaction is transient and unstable.
277993
Which of the following statements about enzymes is incorrect?
1 Enzymes are denatured at high temperature but in certain exceptional organisms. They are effective even at ${{80}^{\circ }}-{{90}^{\circ }}\text{C}$.
2 Enzymes require optimum $\text{pH}$ for maximal activity.
3 Most enzymes are proteins but some are lipids.
4 Enzymes are highly specific.
Explanation:
(c) Almost all enzymes are proteins. Certain RNAs have also been reported to have enzyme property. They are called ribozymes or RNA enzymes. No enzyme exists which is made up of lipid.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277994
Which of the following is not an attribute of enzymes ?
1 They are substrate specific in nature.
2 They are proteinaceous in nature.
3 They are used up in the reaction.
4 They speed up rate of biochemical reaction.
Explanation:
(c) Enzymes increase the rate of reaction without being consumed in the reaction.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277995
"All enzymes are proteins." This statement is now modified because an apparent exception to this biological truth is
1 arylsulfatase
2 dehydrogenase
3 ribozyme
4 nitroreductase
Explanation:
(c) All enzymes are proteinaceous in nature. This statement is now modified due to exception of ribozyme. Ribozymes are RNA molecules which catalyses specific biochemical reactions.
NCERT Page-154 / N-112
BIOMOLECULES(NCERT)
277996
Apoenzyme is
1 protein
2 carbohydrate
3 vitamin
4 amino acid
Explanation:
(a) Enzymes are profeinaceous molecules. Simple enzymes are composed of only protein, while holoenzymes are composed of protein part (apoenzyme) and non-protein part (prosthetic group).
NCERT Page-159 / N-118
BIOMOLECULES(NCERT)
277997
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.
Explanation:
(b) Transition state structure formed during an enzymatic reaction is transient and unstable.
