Which statement about prokaryotes that use chlorophyll a as their photosynthetic pigment is true? A) They use hydrogen sulfide (H₂S) as an electron acceptor. B) They always produce O₂. C) They can grow under dense mats of algae. D) They can absorb lights of longer wavelengths than prokaryotes that use bacteriochlorophyll. E) They include cyanobacteria.

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Prokaryotes that use chlorophyll a as their photosynthetic pigment include cyanobacteria. Choice A is incorrect because prokaryotes that use hydrogen sulfide as an electron acceptor are typically found in sulfide-rich environments and use bacteriochlorophyll as their photosynthetic pigment. Choice B is incorrect because not all prokaryotes that use chlorophyll a produce oxygen. Choice C is incorrect because this statement is not related to the use of chlorophyll a as a photosynthetic pigment. Choice D is incorrect because prokaryotes that use bacteriochlorophyll can absorb light of longer wavelengths than those that use chlorophyll a.

Which Statement About Prokaryotes That Use Chlorophyll a as Their