16552621-Unit-5 - Unit 5. Revision notes in accordance with...

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Stafford Valentine Redden / CHSE / 2004 - 1 Unit 5. Revision notes in accordance with syllabus specifications. 1. Understand that photosynthesis is the synthesis of organic compounds as a result of the fixation and reduction of carbon dioxide (details of intermediate compounds and individual reactions, other than those specified, are not required); Photosynthesis is the fixation of carbon dioxide into organic compounds, by green plants, using solar energy and chlorophyll. The CO 2 is reduced using H + ions from water. 2. Describe the external and internal structure of a dicotyledonous leaf; the location of the palisade tissue; recall the structure of a palisade cell;
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Stafford Valentine Redden / CHSE / 2004 - 2 Unit 5. Revision notes in accordance with syllabus specifications. 3. Recall the structure of a chloroplast as revealed by electron microscopy; identify the envelope, stroma, grana and lamellar structure; understand the location of the chloroplast pigments; x The chloroplast pigments are located in the lamellae (Thylokoid membranes). x These pigments remain embedded in the Thylokoid membrane. x Chlorophylls have a polar ‘porphyrin’ head containing a Mg + ion and a non-polar long hydrocarbon (phytol) tail. The polar head is attached to the proteins of the thylakoid membranes while the non-polar tail extends into the lipid layer of the membrane phospholipid bilayer.
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Stafford Valentine Redden / CHSE / 2004 - 3 Unit 5. Revision notes in accordance with syllabus specifications. x Chlorophylls, carotenoids and electron carriers are assembled together in the thylakoids membrane to form Photosystems I and PS II. 4. Understand the nature of the chloroplast pigments; chlorophyll a and b; carotenoids; (details of chemical formulae not required); understand absorption and action spectra for chloroplast pigments. There are several forms of chlorophyll, differing slightly in colour, chemical structure and absorption peaks. Carotenoids are hydrocarbons situated close to the chlorophyll. The table below shows the nature and occurrence of these pigments. x The absorption spectrum is a graph that shows how much light a particular pigment absorbs at each wavelength. It is made by subjecting selections of each pigment to different wavelengths of light and measuring how much light is absorbed.
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Stafford Valentine Redden / CHSE / 2004 - 4 Unit 5. Revision notes in accordance with syllabus specifications. x An action spectrum is a graph that shows the rate of photosynthesis at different wavelength of light. It can be obtained by allowing plants, such as Canadian pondweed, to photosynthesis for a stated time at each wavelength in turn and measuring the volume of gas evolved. A graph is then plotted of rate of photosynthesis against wavelength of light. x
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This note was uploaded on 12/04/2009 for the course BIOL 230 taught by Professor Gibson during the Spring '09 term at Tennessee Martin.

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16552621-Unit-5 - Unit 5. Revision notes in accordance with...

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