試題詳解

4. Microorganisms play important roles in carbon and nitrogen cycle. Please choose a correct one from the followings.
(A) Nitrifying bacteria can reduce atmospheric molecular nitrogen (N₂) into nitrite.
(B) The anammox reaction is an aerobic reaction, in which ammonium ion is used as the terminal electron acceptor.
(C) In carbon cycle, all fixed carbon can be oxidized back to CO₂ again only by anaerobic respiration, but not by fermentation.
(D) In the second step of nitrification, bacteria convert ammonium ion   into nitrite.
(E) Microorganisms can facilitate carbon fixation in anoxic environments by chemolithoautotrophy in the absence of light.