Classification of bacteria

Question 1

Gram positive stain and shape

Answer 1

Violet/ blue stain. Cocci shape. (spheres)
Staphylococcus aureus: Gram-positive cocci that form grape-like clusters.

Streptococcus pneumoniae: Gram-positive cocci that form chains.

Bacillus anthracis: Gram-positive, spore-forming bacilli that are rod-shaped and may form chains.

Clostridium tetani: Gram-positive, spore-forming bacilli that are rod-shaped and may form chains.

Lactobacillus acidophilus: Gram-positive bacilli that are rod-shaped and may form chains.

Corynebacterium diphtheriae: Gram-positive bacilli that are club-shaped and may form palisades.

Question 2

Gram negative stain and shape

Answer 2

Pink/Red stain. Spiral shape, sphere, rods.
Escherichia coli: Gram-negative bacilli that are rod-shaped and may form short chains.

Pseudomonas aeruginosa: Gram-negative bacilli that are rod-shaped and may form chains. They can also be motile with a single polar flagellum.

Neisseria gonorrhoeae: Gram-negative cocci that occur in pairs (diplococci).

Vibrio cholerae: Gram-negative curved or comma-shaped bacilli.

Helicobacter pylori: Gram-negative spirilla that are helical or curved shaped.