Photoheterotrophs

Photoheterotrophs use the energy of sunlight and derive their carbon from organic compounds. Some are facultative in their nutritional capabilities. For example, some members of a group of bacteria called the purple nonsulfur bacteria can grow anaer-obically using light as an energy source and organic compounds as a carbon source (photoheterotrophs). They can also grow aerobically in the dark using organic sources of carbon and energy (chemoheterotrophs). ■ purple nonsulfur bacteria, p. 277

You Are What You Eat

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