52) Anoxygenic photosynthesis, Fe? oxidation, and sulfur oxidation all have whic

Question

52) Anoxygenic photosynthesis, Fe? oxidation, and sulfur oxidation all have which of the following in common: a. O2 serves as the terminal electron acceptor b. All of these metabolisms are confined to anoxic environments c. Reverse electron flow is required for NAD(P)H synthesis d. All of these metabolisms are found only in the Bacteria e. The requirement of light energy 53) Microbes greatly accelerate the generation of acid mine drainage via their role in , the primary pyrite oxidant under low pH conditions. acts to regenerate conditions.which a. Ferrous iron oxidation/O2 b. Ferric iron reduction/ ferric iron c. Ferrous iron oxidation / ferric iron d. Sulfur oxidation/O2 e. Sulfur oxidation/ferric iron 54) Industrial mercury emissions in the formenter the atmosphere and are deposited in terrest or aquatic environment in the form of a. Hg/Hgs d. Hgo HgS b. Hig2+ / CH3-Hig. e. Hg Hg 55) In fermentation, ATP is produced by a. Substrate-level phosphorylation b. Oxidative phosphorylation c. Photophosphorylation e. None of the above d. Reverse-electron flow

Explanation / Answer

Question 52)

The second option (b) is correct. Anoxic environment is the environment that contains lesser oxygen than normal environment has. All physiological process given in the question are relating to anoxic condition. Ferrous oxidation also present in Fungus. Therefore, we cannot say that these physiological reactions are only present in bacteria. Here neither NADPH form and nor the O2 work as donor. Here CO2 fixation occurs.

Therefore, only option 2 or (b) is correct.

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