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Effect of pH on Enzymes

Which of the ...

Question

Which of the following is not true concerning enzyme activity?

A

Enzymes are considered organic catalysts

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B

Most enzymes work with a wide variety of substrates

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C

Enzymes are not altered in the course of their action

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D

Enzymes form temporary compounds with their substrates

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Solution

The correct option is B Most enzymes work with a wide variety of substrates
Enzymes are substrate specific and hence they are incapable of working with a variety of substrates.
So, the correct option is 'Most enzymes work with a wide variety of substrates'.

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Similar questions

Q. Of the following statements about enzymes, which ones are true?
(i) enzymes lack in nucleophilic groups
(ii) enzymes are highly specific both in binding chiral substrates and in catalyzing their reactions
(iii) enzymes catalyze chemical reactions by lowering the activation energy
(iv) pepsin in proteolytic enzyme

Q. Match the correct enzyme with their substrate.

Q. Consider the following data:

Enzyme	$K_{m}$ (mM)
A	0.02
B	0.2
C	0.002

Which of the following arrangement is correct with respect to their affinity towards a substrate of the given enzymes?

Q. Identify the wrong statemets.

(a)

The substrate binds to active site of enzyme and not fitting into active site

(b)

The binding of substrate induces the enzyme to alter its shape

(c)

Chemical bonds of substrate break down not to form new enzyme-product complex

(d)

The enzyme releases the products of the reaction and runs through catalytic cycle once again

Q. Complete the following passage(s) with an appropriate word/term to be filled in the blank spaces.
Apoenenzyme, Polypeptide, Prosthetic, Co-enzyme, Cofactors
Enzymes are composed of one or several .......... (1) ........ chains. However, there are a number of cases in which non-protein constituents called ........(2)........ are bound to the the enzyme to make the enzyme catalytically active. In these instances, the protein portion of the enzymes is called the ..........(3)......... Three kinds of cofactors may be identified prosthetic groups, co-enzymes and metal ions. ..........(4).......... groups are organic compounds and are distinguished from other cofactors in that they are tightly bound to the apoenzyme. For example, in peroxidase and catalase, which catalyze the breakdown of hydrogen peroxide to water and oxygen, haem is the prosthetic group and it is a part of the active site of the enzyme. .......(5)......... are also organic compounds but their association with the apoenzyme is only transient, usually occurring during the course of catalysis, Furthermore co-enzymes serve as co-factors in a number of different enzyme catalyzed reactions. The essential chemical components of many coenzymes are vitamins, e.g., coenzyme nicotinamide adenine dinucleotide (NAD) and NADP contain the vitamin niacin.

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