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Download Photosynthesis “Carbon Fixation” λ Energy H20 O2 water oxidized
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Transcript
Handout 1 ~ Lecture 5 “Carbon Fixation” Photosynthesis λ Energy (CH2O)n + heat energy + O2 H2 0 sugars are organic molecules that trap light energy in a biologically useable form. CO2 H2 0 O2 water oxidized light energy + CO2 + H20 sugars + O2 + heat Enzymes directly couple reactions that are energetically favorable reactions to those that are energetically unfavorable Sugars + O2 DNA, RNA, Protein, Organells, Cells, DNA Replication, living forms Biosynthesis ADP Respiration exothermic downhill spontaneous -∆G [E] [E] +∆G uphill endothermic ATP monosaccharides nucleotides Amino Acids fatty acid, etc. oxidized molecules CO2 + H20 + heat CATABOLISM heat lost to environment if not transferred to biological compounds ANABOLISM Metabolism coupled oxidation – reduction reactions oxidation – removal of electrons (break bonds) reduction – addition of electrons (add/form bonds) hydrogenation reactions are reactions dehydrogenation reactions are oxidations Biosynthesis
