Question

Thermolabile protein part of the enzyme is
A. Apoenzyme
B. Proenzyme
C. Holoenzyme
D. Isoenzyme

Answer 1

Hint: Enzymes are typically protein biomolecules that increase the reaction rate of various metabolic processes of the body. These are necessary molecules that serve a wide range of significant functions in the body. The inactive form of the enzyme is the thermolabile protein part.

Complete answer: Enzymes are biological molecules that break larger and complex molecules into smaller pieces that are absorbed easily by the body. Enzymes help binding two or more reactant molecules together to form the product. These biomolecules help speeding up chemical reactions by acting as reaction mediums. Enzymes are like catalysts and hence make several chemical reactions occurring inside the cell fast and more productive. Every chemical reaction that occurs inside the cell has a specific enzyme for it which accelerates it.
The reactant molecules that bind to enzymes are called substrates. These molecules bind on specialized sites of enzymes called dynamic sites. The lock and key model and actuated fit model describe the substrate enzyme collaborations. The main working portion of the enzyme is called apoenzyme. This portion is readily deactivated by heat and thus it is thermolabile. This is the reason due to which enzymes are called temperature sensitive. Also, it is the main protein part of the enzyme. It is inactive unless a co-enzyme molecule attaches to it. The coenzyme molecule is a non-protein molecule. It is the apoenzyme that has a dynamic site over it.
Therefore, from the above discussion, we can conclude that option A is correct.

Note: The enzymes are easily affected by temperature changes. It can be observed during a fever that one becomes fatigued and lazy. This is because of the high temperature during fever causes the degradation of enzymes. As enzymes speed up the reaction, degradation of enzymes leads to slow processes.