Why are we unable to digest cellulose, but able to digest starch, even though they are both made of long chains of glucose molecules?
a. Cellulose has glucose molecules that have been modified with nitrogen, whereas starch hasn't.
b. Cellulose is a form of fiber, and starch is not. Fiber is undigestible.
c. Our bodies have the enzymes necessary to digest starch but not cellulose.
d. We have enzymes to break down both cellulose and starch but breaking down cellulose into its individual parts is bad for us, so we keep it out of food.