Antibiotics

Question 1

How does natural selection cause resistant populations of bacteria to develop?

Answer 1

Antibiotics kills non resistant strains
which allows the resistant strains to survive and multiply
without competition

Question 2

Why do some pathogens spread rapidly?

Answer 2

Pathogens mutates
therefore very few people are immune to the new pathogen
because their immune system would not recognise it

Question 3

A new strain may spread rapidly. Explain why?

Answer 3

resistant pathogens survive
these reproduce
population of resistant pathogens increases

Question 4

Explain how bacteria develop antibiotic resistant?

Answer 4

Some bacteria mutate (become resistant to antibiotic)
Antibiotic kills the non resistant strains
Resistant strains multiply
Each time antibiotics is used more resistant strains survive
Until the whole population of bacteria is resistant to the antibiotic

Question 5

How can resistant strains to antibiotics be prevented?

Answer 5

Finish full course of antibiotics

Question 6

Define the term mutation?

Answer 6

A change in a gene