Discussion
All of the following are true of streptococci except:
Answer: A
Correct answer: They are Gram-negative bacilli
Streptococci are Gram-positive cocci arranged in chains, so this statement is the exception. The other three are true: they are lactic acid bacteria, fermenting sugars to lactic acid as their principal end product; Streptococcus mutans adheres to the enamel pellicle through the glucans it makes from sucrose, which is the first step in dental caries; and they are catalase negative, which is the standard bench test separating them from the catalase-positive staphylococci.
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