Question: proenzyme is also known as?
Answer: A zymogen (/ˈzaɪmədʒən, -moʊ-/), also called a proenzyme (/ˌproʊˈɛnzaɪm/), is an inactive precursor of an enzyme. A zymogen requires a biochemical change (such as a hydrolysis reaction revealing the active site, or changing the configuration to reveal the active site) for it to become an active enzyme.