cellresp - CELL RESPIRATION Cell Respiration = The...

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¾ CELL RESPIRATION Cell Respiration = The production of chemical energy ( ATP ) by cells from organic molecules (food). Aerobic Cell Respiration = The production of chemical energy (ATP) in a cell using oxygen. Aerobic respiration can only occur in an environment that contains oxygen. Anaerobic Cell Respiration = The production of chemical energy (ATP) in a cell without using oxygen. Anaerobic respiration is not as efficient and does not produce as much ATP as aerobic respiration. The cells of aerobic organisms (such as humans) only use anaerobic respiration if there is no oxygen available. AEROBIC CELL RESPIRATION includes that processes of: 1. GLYCOLYSIS 2. KREB’s (or TCA) CYCLE AEROBIC CELL RESPIRATION For each molecule of glucose that enters aerobic cell respiration, a net of about 36 ATP molecules are produced that can be used by the cell as chemical fuel. (Actually about 38 ATPs are made, but 2 ATPs are used by during glycolysis). ATP is the chemical fuel for all cells. There is energy stored within the chemical bonds of an ATP molecule that a cell can use for its various biochemical activities. 1. GLYCOLYSIS Glycolysis occurs in the cytoplasm of cells. Glycolysis is a series of 10 enzyme catalyzed chemical reactions that converts a molecule of glucose (6 carbons) into two molecules of pyruvate (pyruvic acid) each with 3 carbons. During glycolysis, two ATP molecules and 2 NADH molecules are produced. NADH (Nicotinamide Adenine Dinucleotide) is a substance that can store energy in the form of electrons. NAD + is the substance from which NADH is formed. NAD + is made from the vitamin called NIACIN in cells. This NADH will be used during the 3 rd step of aerobic cell respiration. Pyruvate (pyruvic acid)
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This note was uploaded on 10/13/2008 for the course BIO 102 taught by Professor B during the Spring '08 term at University of California, Berkeley.

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cellresp - CELL RESPIRATION Cell Respiration = The...

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