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Bacteria: Friend or Foe - College Essays

Bacteria: Friend or Foe

Most people think that all bacteria are harmful to mankind. But scientifically, there are bacteria which actually are beneficial to us. It is just that only a few people know about these. Bacteria are the most common and ancient microorganisms on earth. Most bacteria are microscopic, measuring 1 micron in length.

Bacteria are composed of a nucleoid where DNA is confined, plasmids which circular DNA structures that are not involved in reproduction. ribosomes, flagella which they use to move, pili which is used for attaching to other cells, cell wall composed of peptidoglycan (polysaccharides +protein), capsule which protects the cell from white blood cells and some do have endospores ...

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contain lipids but lack certain chemicals in their cell wall. Eubacteria are all other bacteria. Most of them are phototrophic; they use the sun's energy as food through the process of photosynthesis.

Another classification of bacteria is according to their need for oxygen to live. Those who do require oxygen to live are considered aerobes. The bacteria that don't use oxygen to live are known as anaerobes. Bacteria can also be classified through their cell shape: cocci which are spherical shaped bacteria, bacilli for rod-shaped and spirilla for spiral-shaped.

Bacteria reproduce asexually through binary fission. Binary fission is the replication of the chromosomes, after which the cell divides to form two identical cells.

Though bacteria are sometimes bad, they can be beneficial to the biosphere. Without bacteria, dead organisms would litter on Earth and would never decay. They are called decomposers. They are also involved in symbiosis, the relationship between two ...

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PAPER DETAILS

Added: 3/5/2011 10:44:55 PM
Submitted By: KWANTISIMO
Category: Biology
Type: Premium Paper
Words: 521
Pages: 2

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