d

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In the presence$/$absence test for coliforms, a $100-$ml water sample is added to a lactose$-$containing broth that is selective for Gram$-$negative rods and contains an inverted tube to trap gas. If coliforms are present, Blank$\_\_\_\_\_\_.$

Multiple select question.

the medium will turn blue

growth will not occur

gas will be trapped in the inverted tube

the lactose will be fermented