Question

Which of the following is not true for isoenzymes?

(a) Regulation specific to distinct tissue and development stages

(b) Distinctive properties and patterns of metabolism to particular organ

(c) Regulatory metabolites are called effector or modulator or modifier

(d) Fine tuning of metabolism

The question was posed to me in homework.

This intriguing question comes from Enzymes in section Enzymes of Enzyme Technology

Answer 1

Correct option is (c) Regulatory metabolites are called effector or modulator or modifier

To explain: The statements which are true for isoenzymes are as follows:

• It provides a means of regulation specific to distinct tissue and development stages.

• Its distribution in tissues gives out distinctive properties and patterns of metabolism to particular organ.

• Its existence provides fine tuning of metabolism in order to meet the need of given tissue or development stage.

“Regulatory metabolites are called effector or modulator or modifier.” This statement in true in case of allosteric enzymes, and not isoenzymes.