Aerobic, Anaerobic Respiration; Fermentation

Aerobic, Anaerobic Respiration; Fermentation - R espi...

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Respiration: I. Introduction: a. Organisms must obtain energy. 2 classes of organisms with 2 different basic methods of getting energy: i. Autotrophs: self-feeding, such as through photosynthesis ii. Heterotrophs: they eat stuff 1. Majority of species’ on earth (95%) are heterotrophs iii. Chemical energy obtained is used to make ATP, which in turn is used for: 1. Movement 2. Driving endergonic reactions 3. How cells obtain ATP: a. Glucose is converted i. In this process, low energy electrons are produced 1. Oxygen may take them up, forming water (aerobic respiration) 2. An organic molecule may take up electrons and form a different organic molecule (fermentation) 3. Inorganic molecule besides Oxygen may take up the electron (anaerobic respiration) ii. Aerobic Respiration: C 6 H 12 O 6 + 6O 2 -> 6CO 2 + 6H 2 O 1. This catabolic reaction (exergonic, provides energy for endergonic) is coupled to the making of ATP. Not 100% of the energy is captured, however, and the spare helps maintain body temp of warm blooded organisms
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2. This requires glucose storage: a. Plants store glucose as starch and occasionally sucrose b. Animals store glucose as starch II. ATP production: a. Glycolysis (breaking down of sugars) i. Glucose (6 carbon) -> 2 pyruvates (3 carbon) ii. 2 ATP, 2 NADH are produced iii. Occurs in the cytoplasm b. Aerobic Respiration (requires oxygen, occurs in mitochondria) i. Take pyruvates, break them down into 2C + 1C (the single carbon is
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Aerobic, Anaerobic Respiration; Fermentation - R espi...

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