Question

Holoenzyme is
A. Protein moiety of enzyme
B. Non-protein moiety of enzyme
C. Complete enzyme
D. Inactive enzyme

Answer 1

Hint: Enzymes or as they are commonly known as the biological catalysts are large protein molecules and are responsible for speeding up the chemical reaction taking place within a biological cell.

Complete Answer:
Let us analyse the options to find the correct answer,

Option A: The apoenzyme is the protein part, and the coenzyme is the non-protein part of a conjugated enzyme. The apoenzyme and coenzyme combinedly result in the formation of holoenzyme, which is a functional enzyme. Thus this option is incorrect.

Option B: Non-protein moiety of enzyme is the coenzyme, thus, this option is incorrect.

Option C: Holoenzyme is an active enzyme, catalytically, and it consists of apoenzyme and cofactor. It is also known as complete enzyme, therefore, this is the correct option.
Enzymes convert these substrates into other molecules, which are called the products.
Cofactors can initiate reactions which cannot occur by the standard amino acids.

Option D: Inactive enzyme - is an incorrect option, because holoenzyme is a catalytically active enzyme.

Therefore, the correct option is C) Complete enzyme.

Note: The enzymes perform a number of functions in our body. Some of them are :-
- They break down large molecules into smaller substances, so that they can be easily absorbed by the body.
- They also play an important role in reorganizing the internal structures of the cells.
- They help in the transduction of signals.
- They perform various biochemical reactions, like - hydrolysis, reduction, oxidation, etc.