BIOL 1500 Lecture Notes - Lecture 5: Atp Synthase, Photosystem I, Stroma (Fluid)
6 Oct 2016
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Within its leaves, photosynthesis is converting sunlight into food. Plants need sunlight, co2, and h2o to make their own food. Co2 and water are consumed and glucose (c6h12o6) and oxygen (o2) are produced. Photosynthesis is essential to sustaining life on earth. Only some wavelengths are visible to us. Different pigments specialize in absorbing different wavelengths. No pigments absorb green light because it has a low relative percentage. Only absorbed light is useful for photosynthesis. Gas exchange occurs at leaf pores called stomata. Each leaf contains mesophyll cells, messo- middle phyllon- leaf. Each chloroplast is comprised of an outer and inner membrane, stroma (fluid region of chloroplast), ribosomes (convert dna into protein), and grana (1 granum, 2 grana thylakoid or thylakos- sac or pouch) A photosystem is a large protein structure in the thylakoid membrane. This is where pigment molecules (such as chlorophyll) are embedded. Photosynthesis occurs in 2 stages: light reaction: uses light, water, co2 to produce oxygen.
