Why is cellulose so difficult for most animals to digest?
| 1. | they don’t have the proper enzyme to break the bonds between subunits |
| 2. | cellulose is made up of chitin, which is indigestible |
| 3. | the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule |
| 4. | there are many hydrogen bonds holding the subunits together |