BIO SCI 93 Chapter Notes - Chapter 10.2: Enzyme, Unit, Nanometre
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9 May 2016
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The light reactions convert solar energy to the. Chemical energy of atp and nadph: chloroplasts are chemical factories powered by the sun. Their thylakoids transform light energy into the chemical energy of atp & nadph: used to synthesize glucose and other molecules that can be sued as energy sources. The nature of sunlight: light is a form of energy known as electromagnetic energy (electromagnetic radiation) Travels in rhythmic waves: electromagnetic waves, are disturbances of electric and magnetic fields rather than disturbances of a material medium such as water. The distance between the crests of electromagnetic waves. Range from less than a nanometer ( rays) to more than a kilometer (radio waves) It can be detected as various colors by the human eye. Photosynthetic pigments: the light receptors: when light meets matter, it may be reflected, transmitted or absorbed. Different pigments absorb light of different wavelengths, and the wavelengths that are absorbed disappear.
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The electron transport chain of the light reactions is responsible for energy coupling. Which statement correctly describes the energy coupling that occurs here?
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__ | The electrons will decrease in potential energy as they are passed along, and this will be used to power the active transport of hydrogen ions. |
__ | The reduction of oxygen at the bottom of the electron transport chain will release energy, and this will be used to synthesize ATP. |
__ | The conversion of NADP+ into NADPH will release energy, and this will be used to reduce carbon dioxide into glyceraldehyde-3-phosphate. |
__ | The facilitated diffusion of water across the thylakoid membrane will release energy, and this will be used to generate an electrochemical gradient of electrons. |