Outline 17 2008 Bioenergetics III Photosynthesis

Outline 17 2008 Bioenergetics III Photosynthesis - Lecture...

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Lecture 17: BIOENERGETICS III: Photosynthesis Summary. The ultimate source of energy for living organisms comes from the sunlight. The cellular process of photosynthesis converts the energy of sunlight into chemical energy in the form of chemically reduced compounds (NADPH) and energy-rich ATP in a series of reactions called the “light reactions”. That energy, in turn, is used to fix the carbon of CO 2 to make sugars – the so-called “Calvin-cycle”, sometimes called the “dark reactions”. In the Calvin cycle, a key enzyme, Rubisco, catalyzes the fixation of CO 2 to make a C-3 sugar. In the presence of oxygen, a competing reaction, photorespiration, reverses the cyclic carbon fixation process. To prevent this, some plants (C4 and CAM plant) have evolved alternative ways of fixing carbon, thereby reducing the losses to photorespiration. Reading Assignment Campbell, N. A. and Reece, J. B. Biology, (2008). Chapter 10. Objectives
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This note was uploaded on 09/13/2009 for the course BIO 1110 taught by Professor Randywayne during the Fall '09 term at Cornell University (Engineering School).

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Outline 17 2008 Bioenergetics III Photosynthesis - Lecture...

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