Constitutive enzymes are produced constitutively by the cell

Cell (biology)

The cell is the basic structural and functional unit of all known living organisms. It is the smallest unit of life that is classified as a living thing, and is often called the building block of life. The Alberts text discusses how the "cellular building blocks" move to shape developing embryos....

 under all physiological condition

Physiological condition

Physiological condition or, more often "physiological conditions" is a term used in biology, biochemistry, and medicine. It refers to conditions of the external or internal milieu that may occur in nature for that organism or cell system, in contrast to artificial laboratory conditions...

s. Therefore, they are not controlled by induction

Induction

-General use:* Induction , induction of childbirth* Rite of passage** Introduction of an individual into a body such as the armed forces** Formal introduction of a priest into possession of the position to which she or he has been presented and instituted...

 or repression

Repressor

In molecular genetics, a repressor is a DNA-binding protein that regulates the expression of one or more genes by binding to the operator and blocking the attachment of RNA polymerase to the promoter, thus preventing transcription of the genes. This blocking of expression is called...

.

"Constitutive enzymes are produced in constant amounts without regard to the physiological
demand or the concentration of the substrate. They are continuously synthesized because
their role in maintaining cell processes or structure is indispensable." -Polyjeet Deb Purkayastha.