Question

+ + + + + + + + + + + + 1 + PR Glu PR Lac MR VP Citrate Starch Gelatin E. coli AG AG P. hauseri A E. aerogenes A A K. pneumoniae AG AG A. faecalis E. faecalis A A K. rhizophila S. aureus A A S. epidermidis A A B. subtilis A C. xerosis B. cereus A + + - - 1 + + - + + + - + 1 + 1 + + + - + Nitrate Sulfur Indole Motility Urea DNase Oxidase Catalase E. coli P. hauseri + E. aerogenes K. pneumoniae + A. faecalis E. faecalis K. rhizophila S. aureus S. epidermidis B. subtilis C. xerosis B. cereus + + + + +

Make 3 dichotomy keys using table:

1. Gram Negative Rods (5 Microbes)

2. Gram positive cocci

3. Gram positive rods (3 microbes)

DNASE test?

Answer 1

Answer:

Three separate dichotomous keys are given for each group of organisms.
Gram (+) rods.
Gram (+) cocci.
Gram (-) rods.

Please note no test is given that differentiates Staphylococcus aureus from Staphylococcus epidermidis. From the listed tests (without results), choose DNase to differentiate between these two. Other tests possible to differentiate these are Coagulase / Hemolysis on Blood Agar and Mannitol fermentation for all of these Staphyloccus aureus will be positive.

Gram (+) Rods:

Gram (+) Rods Bacillus subtilis Bacillus cereus Carynebacterium Xerosis. gelatin Negative 1 Carynebacterium Pasitive Bocereus B.subres Xerosis MR Test Pasitive Bacillus cereus Negaliure Bacillus sublilis

Gram (+) Cocci:

Geam (+) Cocci Stardrylococcus aureus Staphylococcus epidermides Enterococcus faecalis Kocuria ochezophila Glucose Positive S.awrens S. epidermides E. faecalis Negalwe Rochuria chezophila Nitrate Positive S.awreus S. epidermidis Negative Enterococcus faecalis DNAse Positive Staphylococcus Negalue Staphylococcus epidermidis

Gram (-) Rods:

Geam(-) Rods Cescherichia coli Klebsiella pneumonial Preateus hauseri Enterobacter aerogenes Centerol Alcaligenes faecalis Lactase Positive Negatie E. cali P. hauseri K. preumonial A. Jaccatis E aerogenes Positive Negative Cabrate Pasiture Negative beateus Alcaligere fasealus Kipreumonial Escherichia E aerogenes cali عموديل hauseril Nitrate Paribie Klebsiella pneumonial Negalive seenterobacter aerogenes