13421636-Photosynthesis-Process-Part-1

13421636-Photosynthesis-Process-Part-1 - Photosynthesis...

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نم لو±ا ءزج²ا صخ³م Photosynthesis داذعا / د . ب´هيا ( ةيىµح ء´µ¶µك ة·¸ار²ا ةقرف³² ) Photosynthesis Process The chemical equation for photosynthesis in this chemical equation : - The reactants are carbon dioxide and water The products are glucose, oxygen, and water Light energy is converted into chemical energy, which is stored in the glucose molecule. For photosynthesis to take place must be present chlorophyll , enzymes and light . 1-Chlorophyll Chlorophyll is a green pigment found inside the chloroplasts of cells. Chlorophyll traps light energy that is used to split water molecules. Light Absorption By Chlorophyll A 2-A coenzyme is a molecule that can transfer hydrogen and electrons from one reaction to another . In photosynthesis, the coenzyme NADP transfers hydrogen and electrons from light to dark reactions . In humans, many vitamins function as coenzymes.
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نم لو±ا ءزج²ا صخ³م Photosynthesis داذعا / د . ب´هيا ( ةيىµح ء´µ¶µك ة·¸ار²ا ةقرف³² ) The formation of glucose during photosynthesis takes place in two major steps known as the light and dark reactions. Each reaction requires enzymes. Many chemicals used to kill plants work by blocking key enzymes that are needed in photosynthesis. 3-Light can be separated into several different wavelengths: r ed, o range, y ellow, g reen, b lue, i ndigo, and v iolet (ROY G BIV) . The red wavelength of light is the best for photosynthesis . Green is the worst wavelength for photosynthesis because the leaf reflects this wavelength. During the light reactions, light energy trapped by chlorophyll is used to split water molecules ( photolysis ) . When water is split, oxygen and hydrogen are produced. The oxygen molecules exit the leaf through the stomates and enter the atmosphere . The hydrogen atoms combine with molecules of the coenzyme NADP (nicotinamide adenine dinucleotide phosphate) to form NADPH + H + , which is needed in the dark reactions . A coenzyme transfers hydrogen and electrons from one reaction to another. ( Reminder : The hydrogen atom has a proton and an electron.) This movement of electrons is known as the electron transport system (ETS)
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نم لو±ا ءزج²ا صخ³م Photosynthesis داذعا / د . ب´هيا ( ةيىµح ء´µ¶µك ة·¸ار²ا ةقرف³² ) Then, oxygen produced during photosynthesis comes from water molecules due to light energy splits water molecules, producing oxygen and hydrogen. This process is called photolysis. Central role of adenosine 5 _ -triphosphate (ATP) in metabolism , the energy needed for the synthesis of ATP from adenosine 5 _ -diphosphate (ADP) and inorganic phosphate (P i)
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نم لو±ا ءزج²ا صخ³م Photosynthesis داذعا / د . ب´هيا ( ةيىµح ء´µ¶µك ة·¸ار²ا ةقرف³² ) Chloroplasts are the sites where both the light-dependent and light-independent reactions of photosynthesis occur . Chloroplasts consist of an outside phospholipid bilayer membrane called the stroma, within the stroma are stacks of membrane
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This note was uploaded on 12/04/2009 for the course BIOL 230 taught by Professor Gibson during the Spring '09 term at Tennessee Martin.

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13421636-Photosynthesis-Process-Part-1 - Photosynthesis...

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