What is Present in Both the Light-Dependent and Light-Independent Reactions

Question

What is present in both the light-dependent and light-independent reactions?  
A) ATP
B) Oxygen
C) Glucose
D) Rubisco
E) water

Accepted Answer

ATP is used in both the light-dependent and light-independent reactions of photosynthesis. In the light-dependent reactions, ATP is produced by photophosphorylation and is used to power the production of NADPH, which is required for the light-independent reactions. In the light-independent reactions, ATP is used to power the Calvin cycle, which results in the production of glucose. Neither oxygen, glucose, nor Rubisco are present in both reactions, and while water is necessary for the light-dependent reactions, it is not required for the light-independent reactions.