During an experiment using the heavy isotope Oxygen-18, a scientist observes that the oxygen gas released by algae is radioactive. Which reactant provided this oxygen?
Q1. During an experiment using the heavy isotope Oxygen-18, a scientist observes that the oxygen gas released by algae is radioactive. Which reactant provided this oxygen?
Answer: Water
Explanation: Oxygen released during photosynthesis originates from water through photolysis. Carbon dioxide is the tempting wrong choice, but it forms glucose.