Engelmann Concluded That Chlorophyll in the Chloroplasts Is Responsible for Photosynthesis

Engelmann concluded that chlorophyll in the chloroplasts is responsible for photosynthesis based on the following results:

A) Spirogyra cells each contain a long, spiral-shaped, emerald-green chloroplast embedded in the cytoplasm.
B) The action spectrum of photosynthesis matched the maximum production of oxygen by Spirogyra, observed by the greatest accumulation of bacteria in the blue and red regions of the spectrum.
C) Bacteria exposed to the action spectrum for photosynthesis showed no preference to any particular color of light.
D) Accessory pigments transfer some of the energy of excitation produced by green light to chlorophyll molecules.
E) Protons flow through the ATP synthase complex.

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