Why Can Direct Microscopy Not Be Used to Provide a Presumptive

question 23

Multiple Choice

Why can direct microscopy not be used to provide a presumptive identification of the enteric bacteria?

• A) Some members of the genus Gram stain weakly.
• B) The microscopic characteristics are indistinguishable from other gram-negative bacteria.
• C) Some members of the genus do not decolorize well and appear gram-positive.
• D) Some members have very thick capsules, and these do not allow the penetration of the Gram stain.

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