Usually, nutrients are assimilated during metabolism; when they are not assimilated and external products such as hydrogen sulfide gas are formed, this is termed ________ metabolism.
A gram-positive bacterium with a G + C content of 35% would be considered a member of the ________ G + C gram-positive bacteria.
The genus Rhizobium is important for agriculture because it allows _________ plants such as peas to fix nitrogen.