Cyanobacteria, or blue-green algae, are considered the most ancient organisms capable of photosynthesis. Given what you know about cyanobacteria, which of the following is the more similar species?
A. Halobacterium salinarum; A unicellular obligate aerobe that often inhabits hypersaline lakes. This species produces gas vesicles in order to maximize its access to oxygen at the lake's surface.
B. Rickettsia rickettsii; A unicellular intracellular pathogen that infects warm-blooded animals, including humans, causing Rocky Mountain spotted fever.
C. Nitrosolobus multiformis; A unicellular rod-shaped nitrifying bacterium that inhabits subsurface soils at depths associated with plant roots.
D. Nostoc verrucosum; A filamentous species often found in shallow streams and creeks that is capable of fixing atmospheric nitrogen using specialized cells known as heterocytes.
Answer: D
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