The Three Families of Cellular Macromolecules Are Polymerized and Depolymerized

question 8

Multiple Choice

The three families of cellular macromolecules are polymerized and depolymerized by a general mechanism involving water. Each of them has a set of monomers whose polymerization changes the total free energy of the system. Which of the following statements is true regarding these macromolecules?

• A) Each polymerization step requires free-energy input and proceeds by the consumption of one water molecule.
• B) Each depolymerization step requires free-energy input and proceeds by the consumption of one water molecule.
• C) Each polymerization step requires free-energy input and proceeds by the release of one water molecule.
• D) Each depolymerization step requires free-energy input and proceeds by the release of one water molecule.

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