Make a Dichotomous Key using the folowing bacteria to ultimately isolate the fol
ID: 191140 • Letter: M
Question
Make a Dichotomous Key using the folowing bacteria to ultimately isolate the following organims using PEA, gram stain, catalase test, oxidase test, MSA, etc.:
Proteus Acinetobacter Staphylococcus Micrococcus
Lactobacillus Salmonella Escherichia Neisseria
Bacillus Shingella Klebsiella Citrobacter
Serratia Enterobacter Pseudomonas Streptococcus
Explanation / Answer
Bacteria
PEA
Gram Stain
Catalase Test
Oxidase Test
Proteus
Inhibits the growth
Negative
Positive
Negative
Lactobacilllus
Promotes the growth
Positive
Negative
Negative
Bacillus
Promotes the growth
Positive
Positive
Negative
Serratia
Inhibits the growth
Negative
Positive
Negative
Acinetobacter
Inhibits the growth
Negative
Positive
Negative
Salmonella
Inhibits the growth
Negative
Positive
Negative
Shingella
Inhibits the growth
Negative
Positive
Negative
Enterobacter
Inhibits the growth
Negative
Positive
Negative
Staphylococcus
Promotes the growth
Positive
Positive
Negative
Escherichia
Inhibits the growth
Negative
Positive
Negative
Klebsiella
Inhibits the growth
Negative
Positive
Negative
Pseudomonas
Inhibits the growth
Negative
Positive
Negative
Micrococcus
Promotes the growth
Positive
Positive
Positive
Neisseria
Inhibits the growth
Negative
Positive
Positive
Citrobacter
Inhibits the growth
Negative
Positive
Negative
Streptococcus
Promotes the growth
Positive
Negative
Negative
PEA Test – Phenylethyl alcohol agar (PEA) is a selective medium test which is specific for gram positive bacteria. The selective medium inhibits the growth of gram negative bacteria and promotes growth of gram positive ones.
Bacteria
PEA
Gram Stain
Catalase Test
Oxidase Test
Proteus
Inhibits the growth
Negative
Positive
Negative
Lactobacilllus
Promotes the growth
Positive
Negative
Negative
Bacillus
Promotes the growth
Positive
Positive
Negative
Serratia
Inhibits the growth
Negative
Positive
Negative
Acinetobacter
Inhibits the growth
Negative
Positive
Negative
Salmonella
Inhibits the growth
Negative
Positive
Negative
Shingella
Inhibits the growth
Negative
Positive
Negative
Enterobacter
Inhibits the growth
Negative
Positive
Negative
Staphylococcus
Promotes the growth
Positive
Positive
Negative
Escherichia
Inhibits the growth
Negative
Positive
Negative
Klebsiella
Inhibits the growth
Negative
Positive
Negative
Pseudomonas
Inhibits the growth
Negative
Positive
Negative
Micrococcus
Promotes the growth
Positive
Positive
Positive
Neisseria
Inhibits the growth
Negative
Positive
Positive
Citrobacter
Inhibits the growth
Negative
Positive
Negative
Streptococcus
Promotes the growth
Positive
Negative
Negative
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.