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Bacteria are bounded by semipermeable cytoplasmic membranes, often including aquaporins. ... The cell wall of Gram-negative bacteria (such as E. coli) is bounded by an outer lipid membrane that includes porins like those of mitochondria. The area between the outer and cytoplasmic membranes is denoted the “periplasm.”
C. Most immigrant groups moved to urban areas, where they settled in ethnic enclaves with people of the same ethnicity.
