Antibiotics are drugs that kills and are used to treat bacterial . They work by inhibiting key biochemical processes in bacteria such as protein .

Antibiotic resistance can occur by mutations to chromosomal DNA or by acquisition of antibiotic resistance genes by . When we use antibiotics to kill populations of bacteria, all of the susceptible cells will be , allowing the resistant cells to

Improper and widespread use of antibiotics speeds up the of antibiotic resistance. Some examples of improper use include: subscribing antibiotics for infections caused by , and use in such as cows to speed up their growth.