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3. After incubating both tubes for the Nitrate reduction test, you observe a colorless reaction in both tubes. What two assumptions can you make about this result?Why is Zinc used

if there was no color change observed after the addition of reagent 1 and 2?After the addition of Zinc, you observe a red color, what does this indicate and what enzyme(s)does your bacteria possess? (2 point)

Fig: 1