Role of o2 in metabolism (prokaryotes)

Question 1

obligate aerobes

Answer 1

must use o2 for cellular respiration and cant grow without it

Question 2

obligate anaerobes

Answer 2

poisoned by o2. some live exclusively by fermentation. others extract chemical energy by anaerobic respiration

Question 3

anaerobic respiration

Answer 3

substances other than o2, such as nitrate ions (NO3-) or sulfate ions (SO4 2-), accept electrons at the “downhill”end of electron transport chains

Question 4

faculative anaerobes

Answer 4

use O2 if it’s present, but can also carry out fermentation or anaerobic respiration in an anaerobic environment.