Which of the Following is NOT an Oxygenic Phototrophic Microorganism

Question

Which of the following is NOT an oxygenic phototrophic microorganism present in marine waters?
A) Ostreococcus
B) Prochlorococcus
C) Roseobacter
D) Trichodesmium

Accepted Answer

Roseobacter is a marine bacterium that is not photosynthetic and therefore not an oxygenic phototroph. The other three choices are all oxygenic phototrophic microorganisms present in marine waters.