Question

Lysozyme is found in
A) Saliva
B) Tears
C) Mitochondria
D) Both A and B

Answer 1

Hint:Lysozyme is a naturally occurring enzyme found in body secretions, which can act as an antimicrobial agent.

Complete answer:
Before looking into the answer, let's have a look at the details of lysozyme.
Lysozyme, also known as muramidase, is an enzyme produced by animals which acts as an antimicrobial agent and also a part of the body's immune system. It was discovered by Alexander Fleming in the early twentieth century. Lysozyme is abundantly found in tears, human saliva, mucus etc. These enzymes function by attacking and hydrolysis of glycosidic bonds in peptidoglycan. They can also break down glycosidic bonds in chitin. This enzyme is a hydrolase, which can catalyse the hydrolysis of 1,4-B-linkages between NAG and NAM residues in peptidoglycan. It cuts the sugar chain in bacterial cell walls, which cause bacteria to burst.

Now, let's look at the options for the correct answer.
>Option A: Lysozyme is found in saliva. But it is not the only site of lysozyme. Therefore, this is the incorrect option.
>Option B: Lysozyme is found in tears. But it is not the only site for lysozyme. Therefore, this is the incorrect option.
>Option C: Lysozyme is not found in mitochondria. Therefore, this is the incorrect option.
>Option D: Since lysozyme is seen in both tears and saliva, this is the correct option.

Thus, the correct answer is option (D) Both A and B

Note:The enzyme lysozyme is present in bacteriophages at the tail region. They use lysozyme to cause infections in bacteria and cause the breakage of the cell wall of bacteria.