bio155_Lecture_6_Carbon_Oxygen

bio155_Lecture_6_Carbon_Oxygen - BIOE 155, Fall 2009...

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BIOE 155, Fall 2009 CHEMICAL: CARBON and OXYGEN (read 44-45; 232-239 in Dodson) BACKGROUND INFORMATION Types of molecules Organic : compounds containing Carbon-Hydrogen bonds Inorganic : everything else. Photosynthesis Primary producers (plants) uses carbon dioxide, water, and light energy to make sugars, releasing oxygen gas as a byproduct. 6CO 2 + 6H 2 O + light Æ C 6 H 12 O 6 + 6O 2 Respiration Aerobic respiration uses oxygen to break-down sugars, generating energy (ATP), and releasing CO 2 as a byproduct. This process does NOT require light. Respiration can also occur in the absence of oxygen (anaerobic respiration), but this pathway is less efficient. C 6 H 12 O 6 + 6O 2 Æ 6CO 2 + 6H 2 0 + energy OXYGEN Oxygen is required by many organisms and controls chemical reactions (redox reactions), so understanding its distribution can inform much about the ecology of a freshwater. Forms of Oxygen found in freshwaters Oxygen gas (0 2 )—readily dissolves in water. Remember that solubility is temperature dependent (colder = higher solubility). Inorganic molecules—Oxygen comprises a part of many inorganic molecules including H20, Nitrate (NO 3 ), etc. Organic molecules—Oxygen comprises a part of many organic molecules, attaching to carbon chains found on things like amino acids, lipids, sugars; the building blocks of living organisms. Major reservoirs of Oxygen are: Rocks (lithosphere)—however, this oxygen is relatively inaccessible due to the strength of these bonds. Atmosphere—O 2 forms 21% of the atmosphere. Oxygen can diffuse into lakes and be mixed down given turbulence.
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This note was uploaded on 11/06/2009 for the course BIO 155 taught by Professor Moore during the Fall '09 term at University of California, Santa Cruz.

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bio155_Lecture_6_Carbon_Oxygen - BIOE 155, Fall 2009...

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