1) Which of the following apply(ies) to Bacillus cereus and Bacillus anthracis? Choose all that apply: a) B. anthracis forms spores while B. cereus does not b) B. cereus is more lethal when it causes an infection c) B. anthracis has extra-chromosomal DNA that makes it more pathogenic d) Despite their similar names, the two are actually not at all related e) The 16S rRNA gene sequences of these bacteria are more than 99% identical, meaning that they are actually members of the same species
1) Which of the following apply(ies) to Bacillus cereus and Bacillus anthracis? Choose all that apply:
a) B. anthracis forms spores while B. cereus does not
b) B. cereus is more lethal when it causes an infection
c) B. anthracis has extra-chromosomal DNA that makes it more pathogenic
d) Despite their similar names, the two are actually not at all related
e) The 16S rRNA gene sequences of these bacteria are more than 99% identical, meaning that they are actually members of the same species
Bacillus is a genus of Gram-positive, bacilli, or rod-shaped bacteria. B. anthracis is the causative agent for anthrax. B. cereus is another medically important pathogen, that has been implicated in food poisoning.
Gram-positive bacteria are those that stain purple in the Gram staining procedure. They have a thick peptidoglycan cell wall that retains the purple crystal violet, which is the primary stain. The secondary stain safranine is not visible. In contrast, the Gram-negative bacteria have a very thin peptidoglycan layer. They stain red in the Gram-stain procedure as they lose the primary stain.
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