Halobacterium Has a Photosynthetic Membrane That Appears Purple

question 1

Multiple Choice

Halobacterium has a photosynthetic membrane that appears purple. Its photosynthetic action spectrum is the inverse of the action spectrum for green plants (see figure) . That is, the Halobacterium action spectrum has a peak where the green plant action spectrum has a trough. What wavelengths of light do the Halobacterium photosynthetic pigments absorb?

• A) red and yellow
• B) violet and blue
• C) green and yellow
• D) blue and red

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