Lab practical study - Nitrate reduction
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Last updated 12:39 AM on 4/7/26
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4 Terms
1
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Add nitrate A and B to the broth, you get a red color change. What does that mean?
That is a POSITIVE result (partial nitrate reduction), The bacteria reduced nitrate (NO₃⁻) → nitrite (NO₂⁻)
2
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Add nitrate A and B to the broth, you get no color change. the you add zinc and there is a red color change what does that mean?
The bacteria did NOT reduce nitrate at all
3
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Add nitrate A and B to the broth, you get no color change. the you add zinc and there is still no color change what does that mean?
The organism performed anaerobic respiration and It has enzymes to fully reduce nitrate
4
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What happens if you get red early, do you add zinc?
no
