If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Light-dependent reactions

Problem

The reaction of the formation of ATP from ADP needs the input of a large amount of energy.
During the formation of ATP in the light reactions, where does this energy come from?
Choose 2 answers: