If you want to find out more about microorganisms you need to Culture them. In other words, grow very large numbers of them so you can see the colony as a whole.
To culture them you must provide them with everything they need. This usually means providing a culture medium containing carbohydrate to act as an energy source. Along with this, various mineral ions and in some cases extra, supplementry protein and vitamins are included.
The nutrients are often contained in an agar medium. Agar is a substance which dissolves in hot water and sets to form a jelly. You pour hot agar containing all the necessary nutrients into a Petri dish. Then leave it to cool and set before you add any microorganisms. The other way to provide nutrients to grow microorganisms is as a broth in a culture flask. Whichever way you do it, you usually need to provide warmth and oxygen as well
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