section13_ak

section13_ak - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 13 Answer Key March 28-29, 2005 Biogeochemical Cycles—Carbon and Energy Metabolism A. Carbon and Energy Options 1. What two things are required by every organism for growth? A source of organic carbon and a source of electrons. Energy is also required. Synthesizers get their energy input from the sun or thermal energy. Heterotrophs get energy from organic carbon. 2. With respect to how organisms acquire organic carbon, we classify them into two groups. What are those groups? With respect to how organisms acquire organic carbon, we classify the organisms into auto- and heterotrophs. Autotrophs synthesize organic carbon from CO 2 and heterotrophs must consume sources of organic carbon. 3. What metabolic process is common to all organisms? What is the result of this process? Glucolysis is common to all organisms. It breaks down glucose into pyruvate and extracts 2 molecules of ATP. 4. In addition to the process in 3, autotrophs also perform another function. What is it? Autotrophs also synthesize organic carbon (glucose) from the CO 2 in the air. 5.
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This note was uploaded on 05/02/2009 for the course BIOL 7.014 taught by Professor Walker during the Spring '05 term at MIT.

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section13_ak - MIT Department of Biology 7.014 Introductory...

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