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    Not all bacteria have cell walls, but many do. The presence or absence of a cell wall depends on the specific type of bacteria. Bacteria are classified into two main groups based on their cell wall structure: Gram-positive and Gram-negative bacteria.

    Gram-positive bacteria have a thick cell wall composed primarily of peptidoglycan, a unique molecule that provides structural support and protection to the cell. Examples of Gram-positive bacteria include Staphylococcus and Streptococcus.

    On the other hand, Gram-negative bacteria have a thinner cell wall composed of a thin layer of peptidoglycan surrounded by an outer membrane containing lipopolysaccharides. Examples of Gram-negative bacteria include Escherichia coli and Pseudomonas aeruginosa.

    However, there are some bacteria known as mycoplasmas that lack a cell wall altogether. Instead, they have a unique cell membrane structure that provides shape and stability to the cell. Mycoplasmas are among the smallest and simplest bacteria known.

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