lesson 5 Flashcards
Name the 4 categories of bacteria
- Harmful/disease causing (aka pathogens)
- undesirable (aka putrefying)
- beneficial
- benign
Does food change taste/appearance once contaminated w/ pathogens?
no
What type of bacteria accelerates decomposition of food?
undesirable
True or false - undesirable bacteria causes food borne illness
false
What food is beneficial bacteria used to produce?
- yoghurt
- sauerkraut
- cheese
- cultured milk
What is the most common type of bacteria?
-benign
What are spores?
-bacteria that forms a shell around itself and remains dormant until conditions are favourable to continue growth
Name 3 spore forming pathogens
- tetanus
- anthrax
- botulism
What is the name of the process of microorganisms splitting in 2?
-binary fission
Ideal conditions for the rapid multiplication of microorganisms
- warmth
- moisture
- nutrients
Name the 4 stages of bacterial growth
- lag (adjusting to conditions)
- log (ideal rapid growth)
- stationary (used up nutrients)
- death (used up nutrients)
6 conditions necessary for growth of bacteria
- Food
- Acidity (low, >4.6 pH)
- Time
- Temperature (warm, in general - 41-140)
- Oxygen
- Moisture (high)
Foods bacteria thrives on
- protein based
- cooked plant based (eg. POTATO)
- seed sprouts
- garlic in oil
Name the bacteria that need
a) oxygen
b) no oxygen
c) ambivalent to oxygen
a) aerobes
b) anaerobes
c) facultatives
What is the name of the bacteria that thrives in the cold (<50)
psychrophilic
