The smallest free-living self-replicating units that do not have a cell wall belong to which genus?

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Multiple Choice

The smallest free-living self-replicating units that do not have a cell wall belong to which genus?

The main idea here is recognizing which bacteria lack a cell wall yet can still live and replicate on their own. Mycoplasma are the smallest free-living bacteria and, uniquely, they have no peptidoglycan in their cell envelope. That absence gives them a pleomorphic shape and makes them not reliably Gram-stainable. They also require cholesterol in their membrane for stability, and many antibiotics that target cell wall synthesis (like penicillins) are ineffective against them. Among the options, only this genus fits the description of being free-living, self-replicating, and lacking a cell wall. The other possibilities listed have cell walls, so they don’t match the criterion.

The main idea here is recognizing which bacteria lack a cell wall yet can still live and replicate on their own. Mycoplasma are the smallest free-living bacteria and, uniquely, they have no peptidoglycan in their cell envelope. That absence gives them a pleomorphic shape and makes them not reliably Gram-stainable. They also require cholesterol in their membrane for stability, and many antibiotics that target cell wall synthesis (like penicillins) are ineffective against them. Among the options, only this genus fits the description of being free-living, self-replicating, and lacking a cell wall. The other possibilities listed have cell walls, so they don’t match the criterion.

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