3a. You are working with a nitrate-oxidizing aerobic bacteria that contains the

Question

3a. You are working with a nitrate-oxidizing aerobic bacteria that contains the enzymes necessary to run the Calvin cycle.

What classification of organism would these bacteria be? What molecule would it use as an electron donor? An electron

acceptor?

b. You find that the organism above has a second electron transport chain that utilizes hydrogen oxidation. Why could

this be beneficial to the organism, especially if the oxygen concentration of the environment is lower?

c. Explain why the bacteria must have a second electron transport chain to utilize the hydrogen instead of just having

two donors for its nitrate-oxidizing chain?

Explanation / Answer

3a anwer =The key enzyme is responsible for calvin cycle in nitrate-oxidizing aerobic bacteria is Ribulose-1,5-bisphosphate carboxylase (Rubisco) and Ribulose 5-phosphate kinase and also Nitrite oxidoreductase.

it is chemolithoautotrophic nitric oxidising bacteria,it is phylogenetically hrtrogeneous .it occurs in wide range of aquetic and terrestial ecosystems.

electron acceptor is O2 and electron doner is nitrate.

hydrogen is a source of energy in the knallgas reaction. still suply of the oxygen .

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