Photosynthesis Part I - Light Reactions
Photosynthesis Part I - Light Reactions BIO 183
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This 2 page Class Notes was uploaded by Anna Huryn on Monday February 22, 2016. The Class Notes belongs to BIO 183 at North Carolina State University taught by Dr. Miriam Ferzli in Fall 2015. Since its upload, it has received 14 views. For similar materials see Intro to Bio Cell/ Micro in Biological Sciences at North Carolina State University.
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Date Created: 02/22/16
Anna Huryn BIO 183: Week #6 Dr. Miriam Ferzli Photosynthesis: Part I – Light Reactions The light reactions are the first step in photosynthesis and are responsible for converting solar energy (sunlight) into chemical energy (ATP and NADPH) Takes place in the thylakoid membrane Photosynthetic Pigments: Pigments = substances that absorb visible light are known as pigments Accessory pigments = pigments with different absorption spectra that photosynthetically important because they broaden the spectrum of colors that can be used for photosynthesis Carotenoids = hydrocarbons that are various shades of yellow and orange (because they absorb violet and blue-green light) and broaden the spectrum of colors that can drive photosynthesis When light meets matter it is either reflected, transmitted or absorbed Different pigments absorb light of different wavelengths, those wavelengths are absorbed and disappear We see green when we look at a leaf because chlorophyll absorbs violet-blue and red light while transmitting and reflecting green light, therefore violet-blue and red light works best for photosynthesis while green is the least effective color Photosynthesis utilizes to main pigments: chlorophyll α and chlorophyll β Anna Huryn BIO 183: Week #6 Dr. Miriam Ferzli Photosystems: Photosystem = composed of chlorophyll molecules, a reaction center, and surrounded by a number of light-harvesting complexes Reaction center = a protein complex that includes two special chlorophyll α molecules and a molecule called a primary electron acceptor Each light harvesting complex consists of pigment molecules (chlorophyll α and β as well as carotenoids) When a pigment molecule absorbs a photon, the energy is transferred from pigment molecule to pigment molecule within a light-harvesting complex until it is funneled into the reaction center The solar-powered transfer of an electron from a special chlorophyll α molecule to the primary electron acceptor is the first step of the light reactions As soon as the chlorophyll electron is excited to a higher energy level, the primary electron acceptor captures it; this is a redox reaction The thylakoid membrane is populated by two types of photosystems: photosystem II (PS II) and photosystem I (PS I) *they were named in order of their discovery, but the two function sequentially, with PS II functioning first The special chlorophyll α molecules found in PS II are known as P680 because they best absorbs light with a wavelength of 680nm The special chlorophyll α molecules found in PS I are known as P700 because they best absorb light with a wavelength of 700nm
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