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

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins