BIOL 201 Lecture 10: Photosynthesis
Document Summary
In bacteria, h+ accumulate between plasma membrane and cell wall. In chloroplast, h+ gradient is generated by light. Photoelectric effect: when you shine light on a metal surface, the light will cause electrons to fly off (electron flow!) E. g. bacteria receiving blue photon and emitting green. This system has high quantum efficiency -- one photon yields one electron. => the electron is not losing any energy as it hops around; it doesn"t drop back to ground state after hopping so much. The q qh2 cycle operates in same principle as complex iii in etc. Oxygen-evolving complex: grabs 2 e- out of the h2o, turns it into 2h+ plus 1/2 o2. The o2 ultimately becomes the electron-receptor in the. Electromagnetic energy is the basis of non-covalent bonds. Cells & molecules are stretched & strained, pushed and pulled . mechanical energy. Thermal energy is at single unit order of magnitude (smallest energy) Baseline of our understanding of cellular energy scales.
