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Cell respiration is used by organisms in order to break down food molecules and release energy for use. Animals acquire the source of their energy through food, and thus begin the process of cell respiration. However, plants must first manufacture the source of their energy through a process called photosynthesis, which is basically the opposite of cell respiration. Glucose is the most common source of energy, and it is turned into ATP (adenosine triphosphate) in three different stages of cell respiration ¨C Glycolosis, the Kreb¡¯s Cycle, and then the electron transport chain. These three phases only occur in aerobic respiration, when oxygen is available. ... Anaerobic respiration, meaning without oxygen, only occurs only in some ¡°parasitic worms and in certain lower plants such as bacteria and yeast¡± (Microsoft Encarta Encyclopedia 98).
The first stage of anaerobic respiration is glycolysis, which occurs in the cytoplasm of a cell (¡°Cell Respiration and ATP Creation¡±, n. ... Enzymes remove hydrogen from the glucose molecules (¡°Cell Respiration¡±, n. ... Glycolysis will occur with or without oxygen, but when oxygen is present, the two molecules of pyruvic acid can then be passed on along the aerobic respiration cycle into what is called the citric acid cycle (Bernstein, 1982, p. ... From the cytoplasm, pyruvic acid passes into the cell¡¯s mitochondria. These are the ¡°sausage shaped structures that host a large surface area for respiration to occur on¡± (¡°Cell Respiration and ATP Creation¡±, n. ... The NADH and FADH2 molecules are the ¡°reduced hydrogen carriers¡± that transport hydrogen atoms to the final stage of aerobic respiration (Baher, 1994, p.
Approximate Word count = 1243
Approximate Pages = 5
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