Multiple choice

In the experiment of photosynthesis, the isotope used by Calvin was

  1. O18

  2. C14

  3. C11

  4. N14
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Melvin Calvin used radioactive Carbon-14 (C14) isotopes to trace the path of carbon in photosynthesis, leading to the discovery of the Calvin cycle. This work earned him the Nobel Prize in Chemistry in 1961. O18 is used in other photosynthesis experiments involving water splitting.

Keep practicing — related questions