Question

Some bacteria can grow in streptomycin containing medium due to

• A. Induced mutation
• B. Natural selection
• C. Reproduction isolation
• D. Mimicry

Answer 1

The correct option is B Natural selection

Antibiotic resistance in Bacteria is a good example of Natural Selection. This is also true for disease-causing bacteria against which we use antibiotics or drugs to kill these bacteria. When a bacteria population encounters a particular antibiotic, those sensitive to it die.

But some bacteria having mutations become resistant to Antibiotic. Such resistant bacteria survive and multiply quickly as the competing bacteria have died. Soon the resistance providing genes become widely spread and the entire bacterial population becomes resistant.