Generally, animals cannot digest (hydrolyze) the glycosidic linkages between the glucose molecules in cellulose. How then do cows get enough nutrients from eating grass?

• A. They have to eat a lot of grass.
• B. Cows and other herbivores are exceptions and make some cellulose-digesting enzymes.
• C. The flat teeth and strong stomach of herbivores break the cellulose fibers so that the cows get enough nutrition from the cell contents.
• D. All of the listed responses are correct.
• E. Microorganisms in their digestive tracts hydrolyze the cellulose to individual glucose units.