5. Predict the metabolic and oxygen tolerant characteristics of the following or

Question

5. Predict the metabolic and oxygen tolerant characteristics of the following organism types: a. For an obligate aerobe: i. Will it have an electron transport chain? ii. Will it have catalase? iii. Will it have superoxide dismutase? iv. What is the final electron acceptor during cellular respiration? v. Does it need to use the citric acid cycle to generate energy or will it rely mostly on glycolysis? b. For an obligate anaerobe Can it have an electron transport chain? If it has an electron transport chain, will the final electron acceptor oxygen? If it does not have an electron transport chain, what general pathway will it use to generate energy? Does it have catalase? Does it have superoxide dismutase? i. ii. iii. iv. v. c. For a facultative anaerobe: i. Does it have an electron transport chain? If so, what is this ETC's final electron acceptor? li. Can it carry out fermentation? ii. Does it have catalase? Does it have superoxide dismutase? d. For an aerotolerant anaerobe

Explanation / Answer

5. a.

i. Obligate aerobes will have electron transport chain.

ii. Obligate aerobes do have catalase. Catalase is an antioxidant and it is found in all aerobic organisms.

iii. Yes aerobes do have superoxide dismutase. Like catalase, superoxide dismutase also is an antioxidant in the aerobic organisms.

iv. The final electron acceptor during cellular respiration by aerobic organisms is molecular oxygen.

v.yes, obligate aerobe does not depend only on glycolysis to produce energy, it require to use citric cycle to produce energy

b.

i. Obligate anaerobes also do have electron transport chain.

ii. In the electron transport chain of obligate anaerobes, molecular oxygen is not the final electron acceptor. Instead, nitrate, sulphate, fumarate, DMSO are used.

iii. If it doesn't have electron transport chain it will use an alternative process called "fermentation".

iv. Obligate anaerobes produce either very less catalase or they do not produce catalase at all.

v.like for catalase, anaerobes either do not produce superoxide dismutase or produce.

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