Question

Where the lysosomes are found?
A. In saliva and tears both
B. In tears
C. In saliva
D. In mitochondria

Answer 1

Hint: Lysozymes can be defined as the particle which contributes to the immune system of the human body. Because of the antibacterial properties it possesses, it becomes a part of the innate immune system.

Complete step by step answer: An antimicrobial enzyme which is produced by animals that form part of the innate immune system is called lysozymes. Lysozyme can also be referred to as muramidase or N – acetylmuramide glycohydrolase. Lysozymes are abundantly found in the tears, human milk, saliva, and mucus. Lysozymes are also observed in cytoplasmic granules of the macrophages and the polymorphonuclear neutrophils (PMNs). Functions of lysozyme include attacking, hydrolyzing, and breaking glycosidic bonds in peptidoglycans. Glycosidic bonds in chitin can also be broken by using lysozymes. In mitochondria, the cell organelle called lysosome is found. The role of the lysosome is to digest the worn-out organelles in the cell. It acts as a suicidal bag. There's a difference between lysosome and lysozyme. The lysosome is the cell organelle present inside the cell however, the lysozyme is usually breaking bonds.
So, from all the above options provided option A: Saliva and tears both is the correct answer as lysosomes are found in tears and saliva.

Note: The egg white also contains a large number of lysozymes. Lysozyme of hen egg white is thermally stable whereas the lysozyme present in human milk loses its activity very soon. Reduced levels of lysozymes can cause bronchopulmonary dysplasia in newborns. Lysozymes protect from gram-positive pathogens like Bacillus and Streptococcus. Lysozymes are also used as natural antibacterial and antiviral compounds in many food and pharmaceuticals.