Conversion of Light Energy to Chemical Energy in Photosynthesis
Photosynthesis is a two step procedure that converts light energy into sugar with oxygen as a byproduct in plant cells. Find out more about conversion of light energy into chemical energy in photosynthesis with help from an experienced biology professional in this free video clip.
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Hi, I'm Dan Weisenberger. And in today's lesson, I'd like to talk about the conversion of light energy to chemical energy in photosynthesis. Photosynthesis outlined here is a two step procedure that converts light energy into sugar with oxygen as a byproduct in plant cells. Specifically photons of light excite chlorophyll pigments which are within the chloroplasts of plant cells. And this chlorophyll pigment basically in the presence of water and manganese, causes electrons to be generated. And a water, two water molecules get split in order to generate these electrons with oxygen. That essentially start up an electron transport chain within this, within the thylakoid membrane of plant cells. The electron transferred into quinones and through a Cytochrome B6F Complex, where they are used to generate an ion pump and protein gradient. Which results in the production of ATP. This all occurs in photosystem two and ironically photosystem one follows. In which the electron tries to fill the empty space left from when the first electron was excited out of the chlorophyll molecule. And this starts another electron transport chain that eventually goes to ferredoxin. And then, converts NADP into NADPH. In step two of photosynthesis is carbon fixation in which the ATP and the NADPH that are generated in step one, enter or are required for the Calvin Cycle. In which CO-two CO2) is converted into sugar and ultimately forms glycerol-3-phosphate. Which is the essential starting material for glycolysis and then, that serves to go through glycolyisis. And then, the citric acids, the cycle acid cycle and Oxidative Phosphorylation. So essentially we have a way of converting light energy into a large amount of chemical energy that the cell can use for cell function and cell growth. I'm Dan Weisenberger. And in today's lesson, I'd like to talk about the conversion of light energy into chemical energy in photosynthesis.