Investigating microbial cultures (AQA GCSE Biology): Flashcards

Chemicals that kill/stop growth of microorganisms

Clear areas around discs where bacteria can't grow

25°C for 2 days

Safe temp; allows growth but not harmful bacteria

Pass ends through Bunsen burner flame

Two diameter measurements at 90° to each other

$\text{area} = \pi r^2$

Divide diameter by 2

More effective antiseptic

Stops harmful bacteria getting out

Wipe bench with disinfectant

Three

Two measurements at 90°

E. coli

Stops bacteria growing over bigger area