How are proteins distinguished from each other?
a. by the amounts of carbon, oxygen, and hydrogen they contain
b. by the kinds of fatty acids they contain
c. by the kinds of bonds that join their monomers
d. by the order of the amino acids that form them?

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Which sequence correctly shows the path of carbon dioxide during repiration?

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?