Chlorophyll is the photoreceptive molecule that
uses the light energy to break apart the hydrogen
and oxygen atoms. There is a magnesium atom in the
center of the porphyrin ring which makes
chlorophyll and that is what absorbs the light
energy. Chlorophyll is also the thing that gives
plants their green color; it absorbs blue and red
light and reflect green light, which is what we
see. There are actually two types of chlorophyll:
chlorophyll a and b. They only differ by their
structure, and chlorophyll b acts as an accessory
chlorophyll to help chlorophyll a. Chlorophyll a
directly participates in the light reactions which
are a part of photosynthesis.
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