Figure 1: (A) Gram-positive and (B) Gram-negative bacteria. Gram-positive (A) bacteria show from the outer to the inner: a) surface proteins; b) capsule; c) cell wall; d) cytoplasmic membrane; e) cytoplasm with nuclear material intersperse. Gram-negative (B) bacteria show from the outer to the inner: a) capsule; b) outer membrane; c) cell wall; d) cytoplasmic membrane; e) cytoplasm with nuclear material intersperse.