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B
Gram-negative bacteria
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C
Cyanobacteria
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D
Bacteriophage
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Solution
The correct option is A Gram-positive bacteria Cell wall of Gram +ve bacteria is made up of peptidoglycans (mucopeptide). Mucopeptide form about 50% of component of cell wall. Cell wall of Gram -ve bacteria is made up of single layer of peptidoglycans.