Which of the following is a chemical barrier that is able to destroy the cell walls of certain harmful bacteria?

a. mucus membranes

b. skin

c. white blood cells

d. enzymes in tears

The best answer is D. The enzymes in tears are the chemical barriers that are able to destroy the cell walls of harmful bacteria. Lysozyme is one of the enzymes found in tears and saliva. This enzyme breaks down the cell walls of foreign microorganisms.

It is D! I just took the test and got all of them right it is D (enzymes in tears)