Question

Overuse of antibiotics can lead to antibiotic-resistant bacteria

Answer 1

When you get sick you normally take antibiotics so it will go away, but if you get this bacteria again and you take the same antibiotic but more times than before the bacteria wont be affected as is resistance to it now, so when you take the antibiotics it wont work as it did normally. The mechanism behind it is that over use of antibiotics will cause the bacterial to secrete an enzyme know as tolerogen against the bacterial which make it to be tolerance against the bacteria. This trait will pass through generations and the bacterial may not feel the effects of the antibiotics again.

Answer 2

The most common form of antibiotic resistance arises when bacteria develop mutations which change the bacterial weakness - the chink their armor - that the antibiotic acted against. For example, many antibiotics interfere with bacteria by disrupting cell wall synthesis. Mutations in the enzymes which create cell wall components make it impossible for the antibiotics to bind to them but don't inhibit the proteins' ability to do its job. So those bacteria with the mutation are antibiotic resistant and survive because of it.