Multiple choice

Cells require all but which of the following for metabolism

  1. energy source

  2. carbon source

  3. electron source

  4. nitrogen source

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

While nitrogen is essential for life, it is not strictly required for basic metabolism in the same way that energy, carbon, and electron sources are. Some organisms can fix nitrogen, but the core metabolic processes rely on the other three.

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