Which of These Potential Results of Applying a Metabolic Poison

question 71

Multiple Choice

Which of these potential results of applying a metabolic poison to the rhizoids of Polytrichum should interfere the least with the ability to draw valid conclusions from this experiment?

• A) If, upon dying, the rhizoids leak nitrogenous compounds into the soil before final nitrogen content is measured.
• B) If, upon dying, decomposition of the rhizoids introduces nitrogenous compounds to the soil before final nitrogen content is measured.
• C) If the metabolic poison is hydrogen cyanide (HCN) or sodium azide (NaN₃), and much of the poison remains in the soil.
• D) If the metabolic poison acts against the mitochondria of the rhizoid cells.
• E) If the metabolic poison absorbs nitrogen and strongly adheres to soil particles, acting as a sort of glue.

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