In the first answer to How do we find antibiotics? @Ashafix claims that
Most bacteria have at least one cell wall
Does this mean that there are bacteria with more than one cell membrane? Which are those and how does that look/work? Are there different milieus in the different compartments?
Cheers
Answer
The phrase you quote is a little unclear, but in looking at the page you link to I believe that @Ashafix was referring to Gram-positive (one cell membrane) and Gram-negative bacteria (two cell membranes).
Each type has only one cell WALL, which refers to the structural peptidoglycan layer, which is between the two membranes in gram-negative bacteria, and is much larger in gram-positive bacteria.
The differences between these two cell types are of some interest with regard to the biology of what structures can sit in the cell membrane and how easy they are to work with in the lab, and how easy things are to get across the cell wall (w/r/t @Ashafix's original point).
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