A Researcher Wants to Determine If a Unicellular Organism He

Multiple Choice

A researcher wants to determine if a unicellular organism he discovered is an autotroph or a heterotroph. He radioactively labels the carbon in CO₂ and C₆H₁₂O₆, and exposes one culture of his organism to the labeled CO₂ and another culture to the labeled C₆H₁₂O₆. What would happen if his organism is an autotroph?

A) Labeled carbon would be seen in the carbohydrates of organisms exposed to CO₂.
B) Labeled carbon would be seen in the carbohydrates of organisms exposed to C₆H₁₂O₆.
C) Labeled carbon would not be seen in the carbohydrates of either culture.
D) Labeled carbon would be seen in carbohydrates of both cultures.