Which of the following groups is incorrectly described?
a. Cyanobacteria—photosynthetic filaments of cells; many species use the pigment bacteriorhodopsin and inhabit very saline waters
b. Proteobacteria—diverse gram-negative bacteria, including pathogens such as Salmonella and Helicobacter pylori and beneficial species such as Rhizobium
c. Chlamydias—intracellular parasites, including a species that causes blindness and nongonococcal urethritis
d. Spirochetes—helical heterotrophs, including pathogens that cause syphilis and Lyme disease
e. Gram-positive bacteria—diverse group that includes actinomycetes, mycoplasmas, and pathogens that cause anthrax, botulism, and tuberculosis
Answer: a. Cyanobacteria—photosynthetic filaments of cells; many species use the pigment bacteriorhodopsin and inhabit very saline waters
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