2.1 The "Light" and "Dark" Reactions of Photosynthesis
To orient ourselves, we imagine zooming in on a chloroplast: from a tree, to a leaf, to a cell in a leaf, and then to the many chloroplasts in a single cell, where the primary processes of photosynthesis occur. In C3 plants most of the chloroplasts are located in the mesophyll cells of the leaves (Fig. 1). Three main processes are distinguished:
1. Absorption of photons by pigments, mainly chlorophylls, associated with two photosystems. The pigments are embedded in internal membrane structures (thylakoids) and absorb a major part of the energy of the photosynthetically
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