Lab Report

Lab Report - Introduction Photosynthesis is the process of...

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Introduction Photosynthesis is the process of converting light energy into simple sugars which an organism can use to sustain life. This process is used by plants, some protists, and some bacteria. Photosynthesis uses six carbon dioxides, six waters, and light energy to create glucose and six oxygen molecules Photosynthesis takes place in the chloroplast of an organism. It is represented by the equation H 2 O + CO 2 Light (CH 2 O) N + O 2 The chloroplast is filled with a sticky fluid known as the stroma and contains stacks of thykaloids. The light dependent part of the reaction occurs within the thykaloid membrane while the light independent reaction, a water molecule breaks apart in the thykaloid membrane and gives off two electrons to Photosystem II. These electrons are then excited by the light energy absorbed by Chlorophyll (a P680) and then passed on to the electron transport chain where these electrons give off energy to actively transport hydrogen ions from the stroma into the thykaloid membrane. These two electrons then move on to Photosystem I where they are again excited when the reaction center (P700) absorbs light energy. After a series of redox reactions in another electron transfer chain, these electrons are accepted by the NADP + in the presence of H+ to form NADPH. At the same time, the light dependent reaction is the facilitated diffusion of H+ from inside the thykaloid membrane to the stroma. This produces energy and created ATP. The NADPH and ATP created from the light dependent reaction are then used in the light independent reaction known as the Calvin Benson Cycle. This cycle which occurs in the stroma, uses NADPH, ATP, and carbon dioxide to produce glucose. Glucose is a sugar which the plant can use as energy.
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Because of the fact that plants grow under many different circumstances and that the
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This note was uploaded on 11/05/2011 for the course BIOL 101 taught by Professor Hogan during the Fall '08 term at UNC.

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Lab Report - Introduction Photosynthesis is the process of...

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