A Danish physician “Hans Christian Gram” developed a technique of staining that determines two groups of bacteria that differ from each other. Gram-positive and Gram-negative bacteria differ due to the differences in the peptidoglycan layer of the cell envelope. Cell envelope is composed of two or three layers that are cell membrane, cell wall, and outer membrane (in some bacteria).

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Chapter 3, Problem 4Q

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A Danish physician “Hans Christian Gram” developed a technique of staining that determines two groups of bacteria that differ from each other. Gram-positive and Gram-negative bacteria differ due to the differences in the peptidoglycan layer of the cell envelope. Cell envelope is composed of two or three layers that are cell membrane, cell wall, and outer membrane (in some bacteria).

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