Download Fig. 1. Common shapes of bacteria Fig. 2: Different arrangements of

Fig. 1. Common shapes of bacteria
Fig. 2: Different arrangements of cocci bacteria.
Fig. 3. A view of the spiral bacteria.
a.
b.
Fig.4a,b: N-acetylglucosamine (NAG) and N-acetlymuramic acid (NAM), the backbone of peptidoglycan
layer connected by interpeptide bridges.?
Table 1: Differences between cell wall of Gram positive and Gram negative bacteria.
Gram positive bacteria
Gram negative bacteria
Peptidoglycan layer very thick (25 nm)
Peptidoglycan layer thin (3 nm)
Peptidoglycan contains Tiecholic acid, an
additional polysaccharide
Tiecholic acid absent
About 60-90% of cell wall is peptidoglycan
Only 10-20% of cell wall is
peptidoglycan
Cell wall contains very little lipids and
Cell wall contains many lipids and
proteins
proteins
They retain crystal violet iodine complex in
Gram staining due to plenty of
peptidoglycan and high thickness
Gram stain is lost due to thinnes of cell
wall and abundance of lipo-proteins
and lipopolyaccharides
Outer membrane absent
Outer membrane present
Periplasmic space absent
Periplasmic space present
Fig.5. Depiction of the outer membrane and periplasmic space in the cell wall.
Fig. 6. Different flagellar arrangements in bacteria.
Fig. 7. Structure of the flagellar components.
Fig. 8: Pilli around bacteria and facilitating bacterial copulation.
Fig. 9: Structure and components of the bacterial cell membrane.
Fig. 10. Bacterial genome
Fig. 11. Endospores of bacteria