psittcsis at aol.com
Mon Feb 23 17:33:17 EST 1998
You're right...stupid question...try looking it up (just teasing...).
Cellular respiration is the combination of oxygen with various substances
within cells resulting in the formation of carbon dioxide and water, and the
liberation of energy. There are many intermediary reactions in which the
substances other than oxygen act as oxidizing agents (for example, the hydrogen
or electron receptors). Reactions are catalyzed by respiratory enzymes which
include the flavoproteins, cytochromes and other enzymes. Certain vitamins are
essential for this process.
Photosynthesis could be considered the plant edition of cellular respiration,
but instead of combining oxygen with substances to liberate water and co2,
plants make carbohydrates by combining carbon dioxide from the air and water
from soil, utilizing light energy in the presence of chlorophyll. Only plants
that have chlorophyll can do this.
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