Into which group would you place a photosynthetic organism that lacks a nucleus and has a thin peptidoglycan wall surrounded by an outer membrane?

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The description matches with that of a proteobacteria, which are gram-negative bacteria with a thin peptidoglycan wall surrounded by an outer membrane. They lack a nucleus and are capable of photosynthesis in some cases. Fungi, Animalia, and Plantae all have a nucleus and are not bacteria. Firmicutes have a thick peptidoglycan wall and are gram-positive bacteria.

Into Which Group Would You Place a Photosynthetic Organism That