Question

Constitutive enzymes are?
A. Operational all the time
B. House-keeping enzymes
C. Allozymes
D. Both A and B

Answer 1

Hint: Constitutive enzymes are the enzymes which are produced continuously in constant rate, without considering the concentration of substrate and requirement of the enzyme. These are produced at a constant amount because of the crucial role in the cell maintaining and structure stability.

Complete answer:
In the human body, protein which acts as catalyst and increases the rate of any metabolic process or reaction is known as enzyme. Like any other chemical catalyst, these biological catalysts that is, enzymes do not participate in the reaction but they help in speeding up the reaction.
Constitutive enzymes are that enzyme which is produced without considering substrate concentration, according to the “Lock and key” hypothesis. Sometimes, such enzymes may be a result of mutation in the regulation of the production system of that particular protein or enzyme.
Constitutive enzymes are produced by the microorganisms and they are produced continuously for presence or absence of the substrate. Thus, we can conclude that constitutive enzymes are helpful in maintaining cell processes and metabolism by continuously working meaning that they are active or operational all the time and they are housekeeping enzymes that help in the proper functioning and structure stability of the human body.

So, the correct option is option ‘D’ that is, Constitutive enzymes are operational all the time and they are housekeeping enzymes.

Note: Every enzyme is very much specific for the substrate, these substrates have pockets or sites where enzymes can bind and modify the shape of the substrate to increase the rate of reaction. The rate of reaction in enzymes can be different in different pH, temperature and humidity conditions.