Photosynthetic Eukaryotes Have Two Photosystems

question 152

Multiple Choice

Photosynthetic eukaryotes have two photosystems. Which of the following hypotheses is believed to explain this?

• A)Two different ancient photosynthetic bacteria took up residence in a primitive eukaryotic host and are present today as chloroplasts.
• B)An ancient species of photosynthetic bacteria with a single photosystem took up residence in a eukaryotic host and eventually evolved a second photosystem.
• C)An ancient species of photosynthetic bacteria with two photosystems took up residence in a primitive eukaryotic host and exist today as chloroplasts.

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