Table 10.2
-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) Escherichia
B) Citrobacter
C) Lactobacillus
D) Pseudomonas
E) Staphylococcus

Question

Table 10.2 
-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) Escherichia 
B) Citrobacter 
C) Lactobacillus 
D) Pseudomonas 
E) Staphylococcus

Quizplus · Accepted Answer

According to the dichotomous key, the only option for a gram-negative rod that ferments lactose and uses citric acid as its sole carbon source is Citrobacter, making the correct choice B. Escherichia and Lactobacillus do ferment lactose but they are not able to use citric acid as their sole carbon source. Pseudomonas is a gram-negative rod but does not ferment lactose, and Staphylococcus is a gram-positive cocci and not a rod.

Table 10.2 -Use the Dichotomous Key in Table 10.2 to Identify a to Identify