Which of the following statements is true? A. Gram-positive bacteria have an outer membrane. B. Gram-negative bacteria have a cell wall made of peptidoglycan, while Gram-positive bacteria have a cell wall made of phospholipids. C. Gram-positive bacteria have a single cell wall formed from peptidoglycan. D. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin.

Bacteria are divided into two groups, namely Gram-positive bacteria and Gram-negative bacteria. This division is done on the basis of reaction of the bacteria to Gram staining.

Gram-positive bacteria lack an outer membrane and consist of many layered peptidoglycan instead. Also, Gram-negative bacterial cell wall is not thick and Gram-positive bacterial cell wall is not thin. It is actually the other way round. The peptidoglycan layers in Gram-positive bacteria make their cell wall thick whereas the few peptidoglycan layers in Gram-negative bacteria make their cell wall thin.

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Hence, the options b, c and d are false.

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Gram-negative bacterial cell wall is made up of few layers of peptidoglycan along with some additional layers which are surrounded by the outer membrane. Cell wall of Gram-positive bacteria is made up of many layers of peptidoglycan and not of phospholipids.

The cell wall of Gram-positive bacteria is made up of only peptidoglycan. Many layers of peptidoglycan form its cell wall.

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Hence, the true answer is option Hopefully this is right if not I am sorry