Question

Lysosome enzymes are active at pH
(A) 5
(B) 7
(C) 8
(D) Variable

Answer 1

Hint: Lysosome enzymes are active at the acidic pH. The lysosome is an organelle that is found in nearly all kinds of eukaryotic cells mainly in cells which has a clearly defined nucleus. This enzyme is liable for the digestion of macromolecules, old cell parts, and microorganisms.

Complete answer:
Lysosomes are membrane-bound organelles that are capable of breaking down biomolecules like proteins, nucleic acids, carbohydrates, and lipids.
They contain enzymes i.e digestive enzymes that help to digest excess or wiped out organelles, food particles, engulfed viruses or bacteria, and macromolecules.
The pH of the inside of the lysosome ranges from 4.5 - 5 (acidic in nature).
All the enzymes which are basically found in the lysosome are acid hydrolases and are active at the acidic pH (pH= 5) which is maintained within the lysosomes.
In Neutrophils and agranulocytes (Monocytes), lysosomes are present in a large number. They help to engulf and neutralize the pathogens and chemicals created by them using the digestive enzymes inside them. So, that's why lysosomes in WBCs are present.
With just a few cytoplasmic granules, the goblet cells seemed virtually drained of mucus. They contained dilated RER and some lysosomes in their cytoplasm. Cytoplasmic vacuolations, autophagic vacuoles, and swollen degenerated mitochondria were shown by enteroendocrine cells with disintegrated cristae.

So, the correct answer is ‘5’.

Note:
pH is the short form for the power of hydrogen. A pH scale 1-14 is used to denote the acidity or basicity of an aqueous solution with pH 1 being the most acidic and ph 14 being most basic or alkaline.