Table 102

I $\quad$ 1 Acid from Glucose $\quad$ $\quad$

Table 10.2

I. Gram-positive
A. Catalase+
$\quad$ 1. Acid from glucose. $\quad$$\quad$$\quad$ Staphylococcus
$\quad$ 2. Glucose $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ Micrococcus
B. Catalase-
$\quad$ 1. Coccus. $\quad$$\quad$$\quad$ Streptococcus
$\quad$ 2. Rod. $\quad$$\quad$$\quad$$\quad$ Lactobacillus

II. Gram-negative
A. Oxidase-
1. Acid from lactose
$\quad$ a. Uses citric acid. $\quad$$\quad$$\quad$ Citrobacter
$\quad$ b. Citric acid $\quad$$\quad$$\quad$$\quad$$\quad$ Escherichia
2. Lactose-
a. $\mathrm{H}_{2} \mathrm{~S}$ produced
$\quad$ (1) Urease positive. $\quad$$\quad$$\quad$$\quad$ Proteus
$\quad$ (2) Urease negative $\quad$$\quad$$\quad$$\quad$ Salmonella
B. Oxidase+
1. Rod. $\quad$$\quad$$\quad$$\quad$$\quad$ Pseudomonas
2. Coccus $\quad$$\quad$$\quad$$\quad$ Neisseria
-Use the dichotomous key in Table 10.2 to identify a gram- negative rod that ferments lactose and uses citric acid as its sole carbon source.

A) Staphylococcus
B) Escherichia
C) Citrobacter
D) Pseudomonas
E) Lactobacillus