micro week 4 post lab.docx - Week 4 post lab 1 Consider the...

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Week 4 post lab 1. Consider the uninoculated tube. (A) is it a positive or a negative control? (B) What information is provided by the uninoculated control? 2.
Why is gas production not recognized as nitrate reduction when the organism is a known fermenter?
3. Many bacteria that are able to metabolize citrate (as seen in the citric acid cycle) produce negative results in this test. Why? Be specific. 4.
Explain how an organism that possesses the citrate lyase enzyme might not test positively on Simmons citrate agar. Is this a false negative result? Why or why not?

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