If plants are grown in the light with CO₂ containing a radioactive isotope of oxygen (¹⁸O),subsequent analysis will show that ¹⁸O incorporated in organic molecules first appears in A)the thylakoid space. B)the thylakoid membranes. C)the stroma. D)mitochondria.

Question

Quizplus · Accepted Answer

Oxygen is produced during the light-dependent reactions in the thylakoid membranes, but it is then used in the Calvin cycle in the stroma to produce organic molecules. Therefore, if radioactive oxygen is incorporated into organic molecules, it would first appear in the stroma.

If Plants Are Grown in the Light with CO2 Containing

If Plants Are Grown in the Light with CO₂ Containing