BIO SCI 93 Lecture Notes - Lecture 10: Cell Membrane, Autotroph, Radiant Energy

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 93
• Professor: Jorge Busciglio Kim Green Marcelo A Wood

Document Summary

The process of photosynthesis most likely originated in a group of bacteria that had infolded regions of the plasma membrane containing clusters of such molecules. The electrons lose potential energy as they fall down the electron transport chain toward electronegative oxygen, and the mitochondrion harnesses that energy to synthesize atp (see figure. 9. 15): photosynthesis reverses the direction of electron flow. Water is split, and electrons are transferred along with hydrogen ions from the water to carbon dioxide, reducing it to sugar. Because the electrons increase in potential energy as they move from water to sugar, this process requires energy in other words is endergonic. In essence, the chloroplast uses light energy to make sugar by coordinating the two stages of photosynthesis: the thylakoids of the chloroplast are the sites of the light reactions, while the. Nadph: thylakoids transform light energy into the chemical energy of atp and.