Definition

A substance that is an inactive form of an enzyme, which becomes active after a specific process called proteolysis.

Example

The body produces proenzymes that are activated when needed for digestion.

Conversation

Have you ever heard of a proenzyme?

No, I haven't. What is it exactly?

It's basically an inactive form of an enzyme that needs to be activated.

That sounds interesting! How does it get activated?

Synonyms & Antonyms

Root Explanation

**Proenzyme** → It is formed from "pro-" (meaning before) and "enzyme" (from Greek "enzymon", meaning leaven or ferment). The word "proenzyme" refers to an inactive precursor of an enzyme that is activated under specific conditions, hence it is an enzyme that exists before it becomes active.

Memory Tip

Think of something that is an enzyme 'before' it becomes active — 'pro-' means before, and 'enzyme' refers to the biological catalyst.

Visually Confused Words