In: Biology
Fill in both "results" columns. Properly write all scientific names, where applicable. Of the organisms listed below, which ones have peptidoglycan in their cell walls? Which ones have lipopolysaccharides in their cell walls?
Organism |
Gram Reaction |
Result |
Arrangement |
Result |
Morphology |
Clostridium |
+ |
Diplo |
Bacilli |
||
Enterobacter |
- |
Single |
Bacilli |
||
Lactobacillus |
+ |
Strepto |
Bacilli |
||
Staphylococcus |
+ |
Staphylo |
Cocci |
||
Streptococcus |
+ |
Strepto |
Cocci |
Organism | Gram Reaction | Result | Arrangement | Result | Morphology |
Clostridium | Positive | Cell wall contains peptidoglycan hence the primary stain crystal violet is trapped in the cell wall and hence purple color is retained. | Diplo | Purple stained, rod shaped bacteria occuring in pairs. | Bacilli |
Enterobacter |
Negative |
Cell wall contains lipopolysaccharide which is washed away with the alcohol treatment which leads to the removal of the primary stain. The pink color of the cells is due to the counterstain. | Single | Pink stained, rod shaped bacteria. | Bacilli |
Lactobacillus | Positive | Cell wall contains peptidoglycan hence the primary stain crystal violet is trapped in the cell wall and hence purple color is retained. | Sterpto | Purple stained, rod shaped bacteria occuring in chains. | Bacili |
Staphylococcus | Positive | Cell wall contains peptidoglycan hence the primary stain crystal violet is trapped in the cell wall and hence purple color is retained. | Staphylo | Purple stained, spherical shaped bacteria occuring in clusters | Cocci |
Streptococcus | Positive | Cell wall contains peptidoglycan hence the primary stain crystal violet is trapped in the cell wall and hence purple color is retained. | Strepto | Purple stained, spherical shaped bacteria occuring in chains. | Cocci |
Rod shaped bacteria are named Bacilli
Spherical shaped bacteria are named Cocci