Chapter 7 Photosynthesis (highest grade in class)

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Louisiana State University
Biological Sciences
BIOL 1001

Chapter 7 PhotosynthesisEnergy cannot be createdLiving things need to obtain energy from outside sourcesAlmost all organisms obtain their energy from the sun directly or indirectlyPhotosynthesis solar energy is trapped and stored as chemical energy in the bonds of organic molecules Synthesis of energyrich organic molecules glucose from energypoor molecules CO and HO22Uses CO as a carbon source and lightenergy as the energy source2Chloroplasts are the site of photosynthesis in plantsLeaves are the major organs of photosynthesisChlorophyll is the green pigment that gives a leaf its colorAlso it is responsible for the absorption of the light energy that drives photosynthesis Chloroplasts are primarily in cells of mesophyll in the leaf interior are the sites of PSFig 71CO and HO enter the leaf through pores called stomata Fig 7222Water is absorbed by the roots and transported to the leaves through the vascular bundlesChloroplasts contain the thylakoids and the stroma Fig 71Thylakoids are flattened membranous sacs inside the chloroplastChlorophyll is located in the thylakoid membraneThe thylakoids are arranged in stacks called granaThe thylakoids are where the lightdependent reactions occurGrana are stacks of thylakoids in a chloroplastLightdependent reactionis the reaction of photosynthesis that converts light energy to chemical bond energy in ATP and NADPH Solar energy to chemical energyOccurs in the thylakoid membranes NADPto NADPHHO is split O byproduct22
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