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The Bacterial Colonies Marked Z Are ________

question 13

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The bacterial colonies marked z are ________.
The bacterial colonies marked z are ________.   A)  colonies of spontaneous his<sup>+</sup> revertants B)  colonies of mutagen-induced his<sup>+</sup> revertants C)  his<sup>-</sup> colonies which grew on the small amount of histidine add to the plate D)  his<sup>+</sup> colonies of E. coli


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