Reactions in cells are generally regulated by regulating the activity of the enzyme that catalyzes that reaction. Broadly speaking, enzyme can be regulated by (a) changing the amount of enzyme present in the cells, or (b) changing the activity of the existing enzymes. Mark all the ways in which the amount of enzyme can be regulated in cells. A. Regulating degradation.
B. Regulating Translation.
C. Regulating Transcription.
D. Binding allosteric regulators.

Enzymes refer to a substance that gets generated within a living species and performs a particular kind of a biochemical reaction by working as a catalyst. The concentration of the enzyme present within the cells can get modified by regulating the rate of the production of enzymes and also the rate of its degradation.  

Thus, regulating the steps of translation, transcription, and degradation of the enzyme would be the ideal choices as all these will determine the concentration of the enzyme present within the cells. Hence, the correct options are A, B, and C. The option D is not correct as the allosteric regulator only helps in changing the activity of an enzyme.