What are enzymes called that are produced within the cell and remain there to catalyze reactions?

Endoenzymes are enzymes that are synthesized inside the cell and function within the cell to catalyze biochemical reactions. They play essential roles in metabolic processes, facilitating reactions necessary for the cell's survival and function. These enzymes help in processes such as cellular respiration, digestion of nutrients, and various biosynthetic pathways.

Exoenzymes, in contrast, are produced inside the cell but are secreted outside to act on substrates in the external environment. This classification distinguishes the location and action of the enzymes. Auxoenzymes refers to enzyme components that require additional factors, like coenzymes, to be active, rather than a classification based on location. Prototrophs are organisms that can synthesize all compounds needed for growth from basic nutrients and are unrelated to enzyme localization.

Understanding the classification of enzymes helps in grasping how cells regulate their internal processes and interact with their environment.