Suppose You Explored a New Planet and Found a Photosynthetic

question 27

Multiple Choice

Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You repeat Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?

• A) The sun of this new planet emits different wavelengths of light than our own.
• B) This new organism is using yellow and green light to drive photosynthesis.
• C) This organism appears green, just like plants on Earth.
• D) This organism utilizes the most energy-rich photons of the spectrum.
• E) This new organism is using blue and red light to drive photosynthesis.

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