Question

Many enzymes are secreted in an inactive form to protect
(a) Cell proteins
(b) Mitochondria
(c) Cell membrane
(d) Cell DNA

Answer 1

Hint: Enzymes are secreted in an inactive form to prevent any kind of reaction of the enzymes with other cells or tissues.

Complete answer:
Protein digesting enzymes are secreted in an inactive form to protect the organs and glands from digestion by the enzymes. If they are released in the active form, they start digesting the glands carrying them and the site where they are released. Also, enzymes are secreted in the inactive form to regulate the proper function of the enzyme. It is released in an inactive form first and goes to the target organ and then is activated when it is needed.
A zymogen also or a protein enzyme is an inactive precursor of an enzyme. The biochemical changes usually occur in Golgi bodies, and a specific part of the precursor enzyme is cleaved to activate it otherwise at all times the enzyme will be inactive. In the case of the pancreas, it secretes zymogens partly to prevent the enzymes from digesting proteins.  Enzymes like pepsin are created in the form of pepsinogen, an inactive zymogen during the digestion of food. The proenzyme pepsinogen, on exposure to hydrochloric acid, gets converted into the active enzyme pepsin which is the proteolytic enzyme present in the stomach for digestion.
So, the correct answer is ‘cell proteins’.

Note:
- Zymogen requires a biochemical change such as a hydrolysis reaction revealing the active site, or changing the configuration to become an active enzyme.
- Cell proteins do most of the work in cells that are required for the structure, function, and regulation of the body's tissues and organs.