5.1 - intro to bacteria Flashcards
shapes of bacteria
cocucs, rods, comma shaped, spiral shaped
why is it better for bacteria to have a small size
- rapid metab for quick diffusion
- leading to rapid turnover of sugars, AA and nucleotides
types of micorbiological media
liquid culture, solid media, selective media and differential media, defined medium and complex
what is selective media
- Used for the growth of only selected microorganisms
- so for antibiotic resistance, you inhibit the growth of the bacteria that doesnt have resistance but allows the bacteria with resistance to grow
what is differential media
can distinguish between diff bacteria
what nutrirents does mirciobioligcal media need
Carbon, nitorgen, oxygen, phosphorus and mineral
what pH does bacteria exhibit
7.4
types of bacteria regarding o2
aerobic, anaerobic
types of anareobic bacteria and their function
aerotolerant - can toleratw O2 and grow in air
obligate - O2 inhibits the growth and kills the bacteria
how can obligate anaerobes survive if they get killed in the air ?
forms spores so its like a dormant form of them
- can grow oncethe conditions are favourable
phases in bacterial growth curve
- lag
- expotential
- stationary
- death
what happens during lag phase
- bacteria adapts to the new environment so their metabolism starts to happen
- slow phase
what happens in expotential phase
- rapid cell growth and metab
- nutirents run out and waste products accum
what happens during stationary phase
- no growth so prepare to survive so the nutrients are used up
groups of bacteria regarding the staining
gram neg and gram pos
