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What key features could be used to differentiate to following groups of gram-positive bacteria: Bacillus, Mycoplasma,...

What key features could be used to differentiate to following groups of gram-positive bacteria: Bacillus, Mycoplasma, and Mycobacterium?
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Along with cell shape, Gram staining is a rapid diagnostic tool of use to group species of bacteria,the key features which differentiate these groups of gram positive bacteria are

Mycoplasma Mycobacterium    Bacillus 1) Pleomorphic, do not have a These species are slightly curved rod shaped bacteria

   definite shape    or straight rods

2) It does not contain a cell wall,    It stained in red colour as they possess ​bacillius will be bright red   

cannot be stained by grams stain. thick peptidoglycan layer    after staining

3) mycoplasma is the genus of family Mycobacterium is a genus of family member of the phylum

Mycoplasmataceae. Mycobacteriaceae. Fermicutes
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