Definitive Proof of N₂ Fixation Is Obtained Using

question 27

Multiple Choice

Definitive proof of N₂ fixation is obtained using

• A) spectrophotometry to measure the opacity of possible nitrogen- containing substances.
• B) gas chromatography to assay for nitrogen uptake.
• C) electrophoresis to analyze the shifts in nitrogen content.
• D) an isotope of nitrogen, ¹⁵N, as a tracer.

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