You need to determine if a pure culture of bacteria is gram-positive or gram-negative, but you've just spilled your only solution of crystal violet so you can't do a Gram stain.  You decide to try a lysozyme treatment on a sample of each culture and then examine the samples under the microscope.  The expected result is

A. gram-positives will lyse and appears as debris; gram-negatives will lose cellular morphology and appear as cocci.
B. gram-negatives will lyse and appears as debris; gram-positives will be unaffected.
C. gram-negatives will lyse and appears as debris; gram-positives will lose cellular morphology and appear as cocci.
D. gram-positives will lyse and appears as debris; gram-negatives will lyse but more slowly.
E. gram-positives will lyse and appears as debris; gram-negatives will be unaffected.


Answer: E

Biology & Microbiology

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