Autotroph organisms

Autotrophs are the organisms that synthesize their own food from photosynthesis. This means they produce glucose in order to feed themselves. A couple examples of these are plants, such as oak trees, algae, and the blue dragon sea slug. These organisms use sunlight in order to synthesize glucose.

The name given to the organisms that use aerobic respiration exclusively to break down glucose are obligate aerobes. They can only survive in environments that contain oxygen, because these organisms oxidize fats and sugars in order to obtain energy. Almost all animals are obligate aerobes. Some examples of these organisms are the Bacillus bacteria, humans, and fish.

Cells that do not use oxygen to meet their energy needs are considered anaerobic organisms. These cells use the fermentation process as their way of obtaining energy. The way they do this is the following: glycosis produces pyruvate, and ATP from glucose, creating lactic acid. Some organisms produce alcohol instead of lactic acid. It is important to note the fermentation produces a considerable amount of less energy than respiration.
Human muscles use fermentation to get energy and certain kinds of yeast create alcohol from fermentation, thus creating beer.

Enzymes are molecules made of proteins, which in turn are made of amino acids. Although enzymes are not direct participants in a chemical reaction they do however how the characteristic that they accelerate the reaction, up to a million times faster than its original rate. Some examples of enzymes are amylase and sucrase.

References

Examples of Cellular Enzymes. (n.d.). Cellular Enzymes. Retrieved May 23, 2009,
from http://faculty.southwest.tn.edu/jiwilliams/examples_of_enzymes.htm

Schulte McMenamin, D. L. (1990). The garden of Ediacara. In The Emergence of
Animals . Retrieved May 24, 2009, from http://books.google.com/
books?id=pBEkPTUCVtEC&pg=PA106&lpg=PA106&dq=list+of+autotrophic+organisms+%22some
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Obligate Aerobes. (2008, October 10). Biology Online. Retrieved May 24, 2009,
from http://www.biology-online.org/dictionary/Obligate_aerobe