global carbon cycle study guide

global carbon cycle study guide - BIOL 1311 Global Carbon...

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BIOL 1311 Global Carbon Cycle Study Guide – Fall 2006 Use this guide to assist you in your study of the material covered in the global carbon cycle module. Keep in mind, however, that it is not an exhaustive review of the material covered. To assist you in answering the questions, the concepts addressed here generally follow the order in which the material is presented in lecture. Feel free to work with your peers on these questions. Introduction to global carbon cycling 1) Describe the difference between biotic and abiotic elements of an ecosystem? An ecosystem consists of all the organisms in a particular region along with nonliving components. These nonliving, or abiotic , components include air, water, and soil. The biotic components, in contrast, consist of other members of the organism’s own species as well as individuals of other species. Biotic components are made of organic molecules. 2) How are organic molecules different from inorganic molecules? Organic molecules contain C-H bonds and are associated with living beings whereas inorganic molecules are those primarily associated with the non-living (mineral) world that do not contain C-H bonds. Carbon fixation is the formation of formation of C-H bonds through the process of photosynthesis by harnessing energy from the sun. 3) Describe the three categories of life history strategies used in lecture. A life history strategy is an organism’s approach to survival including mechanisms for exploiting the environment, coping with hazards and reproducing - Mobile Predatory Heterotrophs: predatory = seeks prey heterotroph = feeds on energy from chemicals assembled by other organisms Ex: All animals ( Animalia ), some protozoa ( Protista ), some Bacteria and Archaea - Walled Autotrophs: autotroph = self feeders, somewhat mobile, collect energy from nonliving world, most do so through photosynthesis Ex: Almost all plants ( Plantae , exception = some parasites) , Algae ( Protista ) – ancestor to plants , Some bacteria – inventers of photosynthesis, very small part are photosynthetic = cyanobacteria. - Walled Heterotrophs: scavengers , major decomposers , solution feeders = take in dissolved chemicals Ex: Fungi ( Fungi ) , Most bacteria ( Monera and Archaea ) 4) Why is a carbohydrate such as methane higher in energy than a molecule of CO 2 ? Methane is less stable than CO 2 , thus it is higher in electronegativity. CO 2 is more stable and does not want to give up its electrons. The electrons are stores and moved in methane through high energy molecules such as ATP. 5) Why is CO 2 critical for plant growth? It is a substrate for photosynthesis. Without it, the plant can not produce energy. 6) Do plants need oxygen to grow?
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This note was uploaded on 01/24/2010 for the course BIO 1311 taught by Professor Shinkle during the Spring '06 term at Trinity University.

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global carbon cycle study guide - BIOL 1311 Global Carbon...

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