Aerobic Respiration - Exercise #6
Your lab uses the facultative anaerobe E. coli K-12 strain MG1655 as its model organism. You have been asked to study some of the enzymes involved in aerobic respiration.
- You are specifically looking at NADH dehydrogenase I and II (NDH-1 and NDH-2). Upon examining their reactions, you notice something uniquely different between the two. What is it? (Hint: look at their enzymatic reaction diagram)
- Only NDH-1 functions under microaerophilic conditions; expression of the NDH-2 gene is repressed when molecular oxygen levels are low. Explain why.