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Biochemistry

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Nitrogen Fixation: Who Can and Who Cannot?

BIOCHM-$4BAR1

Earth's atmosphere contains about 78% ${ N }_{ 2 }$ gas. Elemental $N$ is essential for life on earth, being found in all nucleic and amino acids. Despite the large abundance of ${ N }_{ 2 }$ gas in the atmosphere, nitrogen is not equally available to all organisms due to the strong triple bond between the two nitrogen atoms​.

Identify ALL of the following organisms or group of organisms that contain members that can independently fix or convert ${ N }_{ 2 }$ in the atmosphere to a biologically usable form, such as ammonia.

Select ALL that apply.

A

Corn plants.

B

Soybean and other legumes.

C

Humans and other vertebrates.

D

Cyanobacteria.

E

Diazotrophs.

F

Termites and other invertebrates.

G

None of the listed organisms are able to independently convert ${ N }_{ 2 }$ gas to a usable form.