Tuesday, 3 June 2014


1. What are bacteria? List down some characteristics of bacteria.
They are a kind of unicellular micro-organisms.
Bacteria can be classified under three main groups, based on shape. The groups are, rod shaped, round, and spiral. Both the spiral and rod shaped bacteria are mostly motile and have a flagellum attached to them. The other kinds of bacteria have rod-like protrusions known as pili that serve as tethers.

2. How can bacteria be identified?
There are two common ways. One is known as Gram Staining. The other is Ziehl-Neeson Staining. Like it's name suggests, both involve staining the bacteria with different substances a in order to separate or remove certain protein coats of the bacteria.

3. Name three common bacteria and places where they can be commonly found.
Streptococcus Pyogenes (sore throats and rashes). Vibrio Cholerae (found in uncooked food substances). Bacillus Subtilis (milk, cream, and cheese).

4. Are all bacteria harmful? If not, name some bacteria beneficial to humans.
No. Streptococcus Thermophilus (strengthens immunity and helps improve functions of the gut). Bifidobacterium Animalis (Aids in the digestion process and can also be taken as a supplement for irritable bowel syndrome and constipation). Lactobacillus acidophilus (Used to boost immunity and also present in many probiotic supplements).

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