Gram-positive bacterial cell wall

Gram-negative bacterial cell wall

In some cases, when bacterial cell wall synthesis is inhibited or destroyed, the bacteria do not necessarily die, but they are unable to maintain their inherent shape and appear polygonal.

1. Substance transport; 2. Respiration and secretion; 3. Biosynthesis; 4. Bacterial division.

Cyst-like or tubular structures formed by invagination, folding, and curling of the cell membrane are more common in Gram-positive bacteria.

Judgment: Pseudo-mitochondria are metachromatic particles (×)

1. It is genetic material outside the chromosome; 2. Double-stranded circular closed DNA; 3. Can be replicated independently in the body; 4. Can be passed to other bacteria through conjugation and transduction; 5. Can be lost on its own or artificially processed disappear.

R plasmid ((drug resistance), F plasmid (male bacteria), Vi plasmid (virulence)

The place where bacteria store energy and nutrients as metachromatic granules

Ordinary pili

sex pili

Fixation---primary staining with crystal violet---mordant staining with iodine solution---decolorization with ethanol---counterstaining with carbolic acid-fuchsin