ou have 4 of 4 attempts remaining / There is a 15% attempt pen Question (1 point

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ou have 4 of 4 attempts remaining / There is a 15% attempt pen Question (1 point) 1st attempt Photoheterotrophic organisms Choose one: A can use light to fix carbon dioxide, but must acquire reduced compounds from the environment as electron donors to power ATP synthesis. B. can use light as an energy source, but must still acquire reduced carbon from the environment. C. can subsist solely on light and inorganic substrates. D. only existed on early Earth and are now all extinct. O SUBM K15/16> 8 OF 16 QUESTIONS COMPLETED

Explanation / Answer

Question: Photoheterotrophic organisms

Answer: B. can use light as an energy source, but must still acquire reduced carbon from the environment.

Photoheterotrophs such as green nonsulfur bacteria and purple nonsulfur bacteria are organisms that use light as an energy source, but cannot use carbon dioxide as a source for their carbon requirements. They depend on organic sources of reduced carbon from the environment to satisfy their carbon requirements.

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