Discussion
The bacteriochlorophylls used by the anoxygenic bacteria have absorbance maxima located in the_____portion(s) of the spectrum.
Answer: D
Correct answer: infrared
Bacteriochlorophylls absorb in the near infrared, at wavelengths beyond about 700 nm and up to 1000 nm or more. That is what lets anoxygenic bacteria live beneath a layer of algae or cyanobacteria: they use the long wavelengths the organisms above them cannot.
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