BIOS 2011 Lab 2 Photosynthesis

The antenna system the thylakoid membrane contains

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Unformatted text preview: r through the mediation of soluble enzymes in the stroma (that is, unlike the molecules involved in the light reactions, the enzymes involved in the dark reactions are not embedded in a membrane). The Antenna System The thylakoid membrane contains many proteins, including pigments such as chlorophyll a and chlorophyll b, the two predominant pigments in green plants. Chlorophyll normally exists in a ground state. However, when light strikes a chlorophyll molecule, its chemical structure allows it to achieve an excited state. The "state" refers to the level of energy of the electrons associated with the molecule. When a photon of light strikes a chlorophyll molecule, the light energy is used to elevate an electron to a higher energy state. If the electron returns immediately to its original state, the energy is re ­emitted as fluorescence or heat. Otherwise, the excitation energy is...
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This note was uploaded on 02/09/2012 for the course BIOLOGY 102 taught by Professor Anderson during the Spring '11 term at Harvard.

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