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Chapter 7

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BIOL 1000
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Chapter 7 – Photosynthesis - Life depends on energy from the sun – suitable temperature, energy required to sustain life - Energy of the sun captured by chlorophyll – used to convert CO into complex energy 2 rich molecules - Photosynthesis – conversion of CO int2 organic molecules using light energy - Photosynthetic organisms = autotrophs (self-feeding) make required organic from CO 2 - Some autotrophs = chemoautotrophs – use inorganic compounds as source of energy - Photoautotrophs = photosynthetic organisms use light energy to synthesize organic molecules o Primary producers – organic molecules synthesized by photosynthesis used by photosynthetic organism , also represent the source of organic molecules for consumers - Bodies of primary producers and consumers provide chemical energy for bacteria, fungi = decomposers - Heterotrophs- consumers and decomposers that require already synthesized source of organic molecules to live - For archaea/halo-bacteria = phototrophy (NOT photosynthesis) – harvest light energy and convert it into chemical energy however the light energy is not used to convert CO2 into carbs - Light reactions and Calvin cycle = conversion o Capture of light energy by pigment molecules utilizes energy to synthesize both NADPH and ATP o C.C : e- and protons carried by NADPH and energy from ATP = convert CO2 – organic form (carb)  Conversion = carbon fixation is reduction rxn of e-/pro added to CO2  In water carbon fixation is = oxygenic photosynthesis – O2 produced as by product of light-dependent splitting water - Eukaryotic (chloroplast) o Thylakoid membrane is where light reaction happens o Stroma is where Calvin cycle takes place o Even if cells like mitochondria or chloroplast they still carry out cellular respiration or are still photosynthetic ex. Cyanobacteria o Photosystem – pigment-protein complexes are basis of photochemical apparatus o Photon on light is inversely related to its wavelength  Shorter wavelength = greater amount of energy photons of that wavelength contain - Photons o After pigment of light absorbs photon of light
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