APchapter10notes - Chapter 10 notes Photosynthesis...

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Unformatted text preview: Chapter 10 notes Photosynthesis Photosynthesis In Nature All life acquires organic compounds for energy and carbon skeletons by one of two ways- Autotrophs : ( autos = self, trophos = feed)- they sustain themselves w/out eating other organisms Photosynthesis In Nature- plants are photoautotrophs because they use light as a source of energy- Heterotrophs : ( hetero = other, different)- live on compounds produced by other organisms Heterotrophs are dependent on photoautotrophs for food and oxygen Photosynthesis In Nature Chloroplasts are the site of photosynthesis in plants All green parts of plants have chloroplasts- color is from chlorophyll , the green pigment in the chloroplasts- chloroplasts are mainly found in the mesophyll , interior tissue of the leaf Photosynthesis In Nature- CO 2 enters/O 2 leaves the leaf through pores called stomata- water is absorbed through the roots 6CO 2 +6H 2 O+light C 6 H 12 O 6 +6O 2 Pathways of Photosynthesis The oxygen produced from photosynthesis comes from the spliting of water, not CO 2- use of oxygen-18 to trace pathway Hydrogen is extracted from water to make sugar- O 2 is a waste product Pathways of Photosynthesis Pathways of Photosynthesis Photosynthesis is made of two processes, each containing several steps 1) Light reaction (AKA light harvesting reaction, light dependent reaction) 2) Calvin cycle (AKA dark reaction, carbon fixation reaction) Pathways of Photosynthesis The light rxn. converts solar energy to chemical energy; occurs in the thylokoid membrane- light absorbed drives a transfer of e- and hydrogen to an acceptor, NADP +- NADP + is reduced to NADPH- ATP is generated from ADP through photophosphorylation Pathways of Photosynthesis The Calvin cycle stores the chemical energy in the form of sugar; occurs in the stroma- CO 2 is incorporated w/ other molecules in the chloroplast through carbon fixation- fixed carbon is reduced to carbohydrates Pathways of Photosynthesis Light is a form of energy known as...
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This note was uploaded on 01/26/2011 for the course BIO 101 taught by Professor Siller during the Spring '10 term at University of Minnesota Duluth.

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APchapter10notes - Chapter 10 notes Photosynthesis...

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