Question

10 chlorhexidine kills microbes by
multiple choice

inactivating enzymes by binding to the active site

forming free radicals that create thymine dimers in the dna

disrupting cell surface tension

blocking dna replication

targeting cell membranes, cell walls and denaturing proteins

Explanation:

Chlorhexidine is a biguanide compound. It acts by interacting with the cell membrane (disrupting its integrity), cell wall (affecting its structure), and also causes denaturation of proteins within the microbial cell. This multi - faceted action leads to the death of microbes.
Inactivating enzymes by binding to the active site is more characteristic of some enzyme - specific inhibitors. Forming free radicals that create thymine dimers in the DNA is a mechanism of action of some radiation - like agents (e.g., ultraviolet radiation). Disrupting cell surface tension is a rather simplistic and not the main mechanism for chlorhexidine. Blocking DNA replication is a mechanism of action of some antiviral or antineoplastic drugs (e.g., some nucleoside analogs).

Answer:

targeting cell membranes, cell walls and denaturing proteins