277784
Which one of the given graph shows the effect of $\text{pH}$ on the velocity of a typical enzymatic reaction $\left( V \right)$ ?
1
2
3
4
Explanation:
(c) Parabolic curve in option (c) correctly represents the effect of pH on the velocity of a typical enzymatic reaction (V). Enzyme shows its highest activity at a particular $\text{pH}$ called the optimum $\text{pH}$. Activity declines both below and above the optimum value.
Biomolecules
277765
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
277766
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
277767
"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.
277784
Which one of the given graph shows the effect of $\text{pH}$ on the velocity of a typical enzymatic reaction $\left( V \right)$ ?
1
2
3
4
Explanation:
(c) Parabolic curve in option (c) correctly represents the effect of pH on the velocity of a typical enzymatic reaction (V). Enzyme shows its highest activity at a particular $\text{pH}$ called the optimum $\text{pH}$. Activity declines both below and above the optimum value.
Biomolecules
277765
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
277766
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
277767
"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.
277784
Which one of the given graph shows the effect of $\text{pH}$ on the velocity of a typical enzymatic reaction $\left( V \right)$ ?
1
2
3
4
Explanation:
(c) Parabolic curve in option (c) correctly represents the effect of pH on the velocity of a typical enzymatic reaction (V). Enzyme shows its highest activity at a particular $\text{pH}$ called the optimum $\text{pH}$. Activity declines both below and above the optimum value.
Biomolecules
277765
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
277766
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
277767
"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.
277784
Which one of the given graph shows the effect of $\text{pH}$ on the velocity of a typical enzymatic reaction $\left( V \right)$ ?
1
2
3
4
Explanation:
(c) Parabolic curve in option (c) correctly represents the effect of pH on the velocity of a typical enzymatic reaction (V). Enzyme shows its highest activity at a particular $\text{pH}$ called the optimum $\text{pH}$. Activity declines both below and above the optimum value.
Biomolecules
277765
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
277766
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
277767
"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.
