Chapter 27 Key Terms anaerobic respiration- (an-er-o´-bik) The use of inorganic molecules other than oxygen to accept electrons at the “downhill” end of electron transport chains. obligate anaerobe- (ob´-lig-et an´-uh-rob) An organism that only carries out fermentation or anaerobic respiration. Such organisms cannot use oxygen and in fact may be poisoned by it. facultative anaerobe- (fak´-ul-ta´-tiv an´-uh-rob) An organism that makes ATP by aerobic respiration if oxygen is present but that switches to anaerobic respiration or fermentation if oxygen is not present. obligate aerobe- (ob´-lig-et ar´-ob) An organism that requires oxygen for cellular respiration and cannot live without it. Heterotroph - (het´-er-o-trof) An organism that obtains organic food molecules by eating other organisms or substances derived from them. Autotroph- (ot´-o-trof) An organism that obtains organic food molecules without eating other organisms or substances derived from other organisms. Autotrophs use energy from the sun or from
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