A soil sample was diluted into a nutrient broth, then spread onto a plate and grown for one week at room temperature. Several colonies appeared dusty or fuzzy and yet were identified as bacteria-not as fungi. Which genus do these isolates likely belong in?
A) Actinomyces
B) Mycobacterium
C) Nocardia
D) Streptomyces

Question

Quizplus · Accepted Answer

Streptomyces are known for their fuzzy, filamentous growth pattern, and are often mistaken for fungi. However, they are actually bacteria and are commonly found in soil. Actinomyces, Mycobacterium, and Nocardia are also common soil-dwelling bacteria, but they do not typically exhibit a fuzzy or filamentous growth pattern.

A Soil Sample Was Diluted into a Nutrient Broth, Then