In the basic equation of photosynthesis for the synthesis of one molecule of a sugar such as glucose, how many molecules of carbon dioxide are required and how many molecules of oxygen are produced?

• 6 water water molecules are oxidized, and become the source of electrons for carbon dioxide reduction.

• 6 molecules of carbon dioxide are required, one for each carbon atom in glucose.

• 6 molecules of oxygen are produced as a by product of water oxidation.

• Sunlight provides the free energy needed to make the endergonic pathway proceed.