Use the dichotomous key in Table 10.2 to identify a gram-negative coccus.
A)Neisseria
B)Pseudomonas
C)Staphylococcus
D)Streptococcus
E)Micrococcus

Question

Quizplus · Accepted Answer

The dichotomous key in Table 10.2 starts by asking if the bacterium is a cocci or a rod. Since this question specifically asks for a gram-negative coccus, we can eliminate choices C, D, and E which are gram-positive cocci or non-cocci. Next, the key asks if the bacterium is oxidase-positive or oxidase-negative, and Neisseria is the only option left which is oxidase-positive. Therefore, the answer is A) Neisseria.

Use the Dichotomous Key in Table 10