1 Flashcards
Exponential growth pattern
Bacteria numbers explode when conditions good ( double in numbers ) every 30 mins
The bacterial Growth Curve
Lag Phase , Exponential growth phase , stationary phase and death phase
Maximum stationary phase
Carrying capacity reached , numbers will no longer rise or down
Numbers of deaths of weak cells are evened out by the cells that are able to tolerate the waste
Death phase
Struggling to survive , used up all bacteria
Halving , ever 30 mins
only strongly selected members survive
Death out weighs reproductions
Crash
When your sick , when you get better you want your bacteria to have a population crash
Decline until hitting 0
Minimum Stationary Stage
A few hardy cells remain
Inside indispores, not reproducing
Or in a pocket and not dying
Metabolically Inactive
Viruses
None reproducing , don’t take in food
Virion
Floating Free
Viruses reproduction
Viruses highjack host cells into reproducing for them
Designs Of Bacteria
Two types of designs of viruses in eukaryotic host cells ( Humans )
Naked , Enveloped
Naked Design
Basic (unenveloped )
Just genetic material with hard shell
Ex . Hep A
Get through contaminated food or water
Very sturdy
Enveloped
Luxury model
Need warm moist environment, ex from sex
Wraps itself in cell membrane ( immune system has a hard time identifying )
Hep B or Aids or Flu
Only in Prokaryotic hosts cells
3-Bacteriophages ( phages ) ( have to get through peptidoglycan wall )
Name bacteria eaters
Viruses that infect and kill bacteria
Eat holes in Petri dish growth film
have to get through peptidoglycan wall
3-Bacteriophages
