NotesL6to10KAS - BioSci 1C - Winter quarter, 2008 Topical...

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BioSci 1C - Winter quarter, 2008 Topical outline and primary educational objectives of lectures 6-10 (6) Leaf Structure & Function: Photosynthesis Fr. G.S.: "Light + Raw Materials in, Food Out" Primary educational objectives: 1) Be able to explain to a non-scientist what each term in the Fr. G.S. version of this lecture means, and how each impacts plant form and function. 2) For a scientist, be able to: a) Sketch and explain a carbon skeleton path (Fig. 10.9) for how CO 2 becomes CH 2 O b) sketch and explain a cartoon diagram (Fig. 10.3) of a chloroplast, showing the transport path for the major players in photosynthesis (electrons, CO 2 , H 2 O, O 2 ). According to some aliens, humans are "bags of mostly water," This is true, but after water, all life is mostly Carbon and Oxygen. Plants are about 45%C, 45%O (dry weight basis). (Where do the C and O come from?) Plants are autotrophs : basic function of leaves = photosynthesis Raw Materials: inorganic (CO 2 , H 2 O). Food: organic (typically carbohydrate of one kind or another - like sugar). "Light in" part. Some straightforward aspects: - Up in the air (e.g., taller is better) - Thin & Flat (umbrella analogy) - Clear protective epidermis - Network of veins for transport Photosynthesis (chlorophyll = green pigment) : - Early ideas chlorophyll as a catalyst for raw material (CO 2 ) Organic compounds (Carbon containing) - More complex 1) Light + H 2 O Energetic Compounds (ATP, NADPH), O 2 by-product; 2) Use Energetic Compounds to make Organic Compounds from CO 2 . "Light-dependent" and "Light-independent" reactions (sometimes called “light” and “dark” reactions. - Light-dependent reactions (know basic reactions and orientation with respect to thylakoid membrane) ("Food out" part.) - Light-independent reactions (know basic carbon skeleton reactions) - Photorespiration ( RUBISCO uses O 2 instead of CO 2 - know significance) All pathways involve coordinated (space and time) recycling of most components, but CO 2 and H 2 O are consumed, O 2 and 3-Carbon compounds are produced.
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Bottom line: Light energy is used to create the energy compounds (ATP, NADPH+H + ) which are used to generate sugars, starch, etc.
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NotesL6to10KAS - BioSci 1C - Winter quarter, 2008 Topical...

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