Which Bacterial Genus is LEAST Related to the Others Listed

Question

Which bacterial genus is LEAST related to the others listed?
A) Actinomyces
B) Mycobacterium
C) Nocardia
D) Streptomyces

Accepted Answer

While all of the listed bacterial genera belong to the phylum Actinobacteria, Mycobacterium is distinct in several ways, including its unique cell wall structure and the fact that it is an obligate aerobe. The other genera listed are more closely related to each other and share many similarities in their morphology, physiology, and ecological roles.