MICROANATOMY

Detailed explanation-1: -Spirochetes are generally easy to culture in the laboratory. The deeply branching bacteria contain species that have evolved most recently. All the bacteria classified within the genus Bacillus are capable of forming endospores. Mycoplasmas are bacteria that lack cell walls.

Detailed explanation-2: -The gram-positive bacteria retain the crystal violet colour and stain purple whereas the gram-negative bacteria lose crystal violet and stain red. Thus, the two types of bacteria are distinguished by gram staining. Gram-negative bacteria are more resistant to antibodies because their cell wall is impenetrable.