Question

Most of hydrolytic enzymes of lysosome function at
A. Acidic pH
B. Alkaline
C. Neutral pH
D. Both (B) and (C)

Answer 1

Hint: Lysosome is a membrane bound organelle having more than 60 different enzymes out of which there are three hydrolytic enzymes which function in 4.5-5 pH.

Complete answer:
First of all, you should know about lysosome. Lysosome is a membrane bound organelle in which there is presence of digestive enzymes and it breaks down excess cell parts. This organelle is involved in various cell processes and it contains enzymes which break down macromolecules and foreign invaders.
It contains more than 60 different enzymes and there is presence of more than 50 membrane proteins. The hydrolytic enzymes are proteases, lipases and nucleases. All these enzymes work best in acidic pH because of the acidic pH, lysosome must actively uptake H+ ions and the pH in lysosome is 5.
Let's look at options now,
> Option A is Acidic pH, this option is correct one as the hydrolytic enzymes released by lysosome functions at acidic pH and the pH is 4.5-5 which is optimal for enzymes involved in hydrolysis i.e., hydrolytic enzymes. Therefore, it is correct.
> Moving to option B which is Alkaline. Alkaline is not the correct option because hydrolytic enzymes require pH of 5 i.e., acidic pH to function hydrolysis proper and this pH is not alkaline. Therefore, it gets eliminated.
> Moving to option C which is Neutral pH, when pH is 7 then it is referred to as neutral pH but hydrolytic enzymes of lysosome required acidic pH to function i.e., pH below 7. There, this option is incorrect and gets eliminated.
> Last option D is both (b) and (c). This option is also incorrect since hydrolytic enzymes do not function in Alkaline and Neutral pH but they function only in acidic pH which makes this option incorrect and it gets eliminated.

Thus, the correct answer is option A i.e., Acidic pH.

Note: The hydrolytic enzymes of lysosome are proteases, lipases and nucleases which works in acidic pH as they actively uptake H+ ions and the fro pH 4.5-5, these enzymes works best as it is the optimal pH for hydrolytic enzymes to function. Therefore, acidic pH is the correct option.