Suspect spore-forming, gram-positive Bacillus species that is c-hemolytic, nonmotile, and penicillin-susceptible and that produces a wide zone of lecithinase on egg yolk agar can be iden-tified as:

a. Corynebacterium diphtheria.
b. B. anthracis.
c. Bacillus cereus.
d. Corynebacterium jeikeium.


B
B. anthracis should be suspected if typical c-hemolytic "Medusa head" colonies are observed on 5% sheep blood agar and if the organism is subsequently found to be nonmotile and lecithi-nase-positive.

Biology & Microbiology

You might also like to view...

Which two biomes are sometimes converted by humans to a desert?

a. Coniferous forests and grasslands b. Woodlands and grass lands c. Savannas and tundra d. Tropical rain forests and savannas e. Woodlands and deciduous forests

Biology & Microbiology

The common passageway for air and food is the ____

a. nasal cavity b. epiglottis c. glottis d. pharynx e. larynx

Biology & Microbiology

Which of the following conditions rise as a consequence of a thinning ozone layer?

A. Increased global temperature B. Increased rain C. Stronger wind D. Air pollution E. Increased rate of skin cancer

Biology & Microbiology

Iris is a long-day plant that normally flowers in the spring. Which regimen would be the most effective in making an iris bloom in late fall?

A) interrupting the plant's nights at 2:00 am with a flash of far-red light B) interrupting the plant's nights at 2:00 am with a flash of red light followed by a flash of far-red light C) interrupting the plant's nights at 2:00 am with a red flash, then a far-red flash, then a red flash D) interrupting the plant's days at 2:00 pm by putting it in the dark

Biology & Microbiology