What Is Life? 2nd Edition by Jay Phelan

Exercise 5

Photosynthesizing plants rely on water:
A) to provide the protons necessary to produce chlorophyll.
B) to concentrate the beams of light hitting a leaf, focusing them on the reaction center.
C) to replenish oxygen molecules that are lost during photosynthesis.
D) to replace electrons that are excited by light energy and passed from molecule to molecule down an electron transport chain.
E) to serve as a high-energy electron carrier.