Nitrogen fixation is carried out by:
a. nitrifying bacteria.
b. prochlorophytes.
c. cyanobacteria.
d. all heterotrophic bacteria.
e. only spirilli-shaped bacteria.
C
You might also like to view...
Classify the following as domains, kingdoms, or neither.
Colchicine, a chemical extracted from the autumn crocus (Colchicum autumnale), inhibits the formation of
microtubules. Mitotic cells exposed to colchicine will therefore be arrested at ____.
a. anaphase b. interphase c. prophase d. telophase e. metaphase
For a normal, healthy individual, what percentage of whole blood is plasma?
a. 25 percent b. 40 percent c. 45 percent d. 55 percent e. 60 percent
Which of the following is a correct pair based on their shared characteristics?
a. the universe and a closed system b. the universe and an open system c. an ocean and an open system d. an ocean and a closed system