NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Absence of a capsule
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Absence of the cell wall
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Absence of flagella
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Absence of spores
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Detailed explanation-1: -Gram-negative bacteria attempting to grow and divide in the presence of peptidoglycan synthesis-inhibiting antibiotics (e.g. penicillin) fail to do so, and instead end up forming spheroplasts.
Detailed explanation-2: -Penicillin kills bacteria through binding of the beta-lactam ring to DD-transpeptidase, inhibiting its cross-linking activity and preventing new cell wall formation. Without a cell wall, a bacterial cell is vulnerable to outside water and molecular pressures, which causes the cell to quickly die.
Detailed explanation-3: -Amoxicillin covers a wide variety of gram-positive bacteria, with some added gram-negative coverage compared to penicillin. Like penicillin, it covers most Streptococcus species and is also effective against Listeria monocytogenes and Enterococcus species.