Growth factors - organic compounds that cannot be synthesized by an organism but are
essential for growth
- amino acids
- purines/pyrmidines
- vitamins
Nutrient Concentration - Growth rate depends on amount of nutrients in the environment
Aerobes - Grow in the presence of oxygen
Obligate aerobes - Require oxygen
Microaerophiles - Grow best when there is less oxygen than normal
Anaerobic - Growth occurs without oxygen
Aerotolerant anaerobes - Aren't harmed by oxygen, but don't use it either.
Obligate anaerobes - Cannot grow when oxygen is present
Facultative anaerobes - Can use oxygen but can also grow in the absence of oxygen
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