Discussion
Actinomyces differs from bacteria in that:
Answer: B
Correct answer: Filamentous organism
The question asks what distinguishes Actinomyces from ordinary bacteria in appearance. It grows as fine branching filaments about 1 micrometre wide that fragment into bacillary and coccoid forms, a mycelial habit that led to its long misclassification as a fungus. The other three options are all shared with many ordinary bacteria and so distinguish nothing. Actinomyces is in fact a true bacterium: its filaments are a tenth the width of a fungal hypha, it has a bacterial cell wall, and it is sensitive to penicillin.
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