BSC 314 Lecture Notes - Lecture 26: P680, Stoma, Organic Compound
27 Jun 2018
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Details of Photosynthesis in Plants
Photosynthesis is a complex of interactions taking place at special times and sites and
with special materials, but relying upon many standard metabolic procedures used
elsewhere in plants and other organisms. All of the reactions are catalyzed (promoted)
by specific enzymes.
The description of photosynthesis here refers to structures and actions in plants, but the
fundamentals apply as well to algae and to some aspects of procaryote (cyanobacterial)
photosynthesis. Most of the reactions occur simultaneously in nanoseconds (10 9) or
less in various parts of the chloroplasts, but understanding the process is easier if it's
separated into sequential steps. The overall process is shown in Figure .
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Energy transferring reactions
The pigment molecules that capture energy from the sun are arranged in the thylakoid membranes of the
chloroplasts in structurally separate units called photosystems. Hundreds of systems are present in each
thylakoid. Each photosystem has a light collecting array of 200–300 molecules, the antenna complex,
not unlike a satellite dish, which collects and focuses the photons into the reaction center where energy
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