If a bacteria is aerobic and if bacteria is motile are the information can be obtain from a nutrient broth.
Sterile means Free of microbes
Pure culture means Single form of organism.
Colony Forming Unit means individual colonies forming from a mass of individual cells or bacteria.
Chromogenesis is the process where different species will produce different colors. It is used to distinguish between the culture you are looking for and the contaminants.
Blue Bell Lystiria scare is n example of a real world situation where knowing how to perform a streak plate technique properly would be important.
If the tube was upright, airborne bacteria could easily contaminate it, so avoid doing it.
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