Question

Antibiotic resistance definition biology

Answer 1

The ability of bacteria and other microorganisms to resist the effects of an antibiotic to which they were once sensitive. Antibiotic resistance is a major concern of overuse of antibiotics. Also known as drug resistance.

Answer 2

Antibiotic Resistance

• The recombinant plasmids lose tetracycline resistance due to insertion of foreign DNA.

• It can be selected out from non recombinants on ampicillin containing medium.

• The transformants growing on ampicillin containing medium are then transferred on a medium containing tetracycline.

• The recombinants will grow in ampicillin containing medium but not on that containing tetracycline.

• However non recombinants will be able to grow on the medium containing both the antibiotics.

• In the present case, one antibitic resistance gene helps in selecting the transformants.

• But the other antibiotic resistance gene becomes inactivated.

• This is due to the insertion of foreign DNA.

• It helps in selection of recombinants.