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Lecture 5a - Lecture 5a Cellular Respiration Overview...

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Lecture 5a Cellular Respiration Overview- Energy Flow & Chemical cycling Energy enters an ecosystem as sunlight (some exists at heat) Photosynthesis traps energy by converting sun energy to chemical energy to chemical energy for cells (more on this later) Cellular respiration harvests energy and forms ATP -Don’t confuse respiration at the organismal level (breathing) and at the cellular level (chemical) ATP directly drives cellular work Autotrophs and Heterotrophs Auto- (“self-fenders”) are organisms that make their own food and organic matter from inorganic nutrients Hetero- (“Other feeders”) can’t make organic molecules from inorganic ones Producers and Consumers Pro- make stuff: plants and other auto’s Con- eat stuff: organisms that eat other organisms to obtain food. Cellular Respiration : the aerobic harvesting of chemical energy from organic food molecules In the production of “useful” energy -Glucose: (+O 2 ) is converted to energy (+CO 2 and H 2 O)
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