Even Though Cellular Macromolecules Contain a Large Number of Carbon

Multiple Choice

Even though cellular macromolecules contain a large number of carbon and hydrogen atoms, they are not all spontaneously converted into CO₂ and H₂O.This absence of spontaneous combustion is due to the fact that biological molecules are relatively __________ and an input of energy is required to reach lower energy states.

A) large
B) polar
C) stable
D) unstable