Question

the chemical reactions that occur in living things are regulated by protein molecules called
select one:
○ a. bonds.
○ b. ions.
○ c. enzymes.
○ d. protons.

Explanation:

To solve this, we analyze each option:

• Option a: Bonds are forces holding atoms together, not protein molecules regulating reactions. Eliminate.
• Option b: Ions are charged particles, not proteins for reaction regulation. Eliminate.
• Option c: Enzymes are protein molecules that act as biological catalysts, regulating (speeding up) chemical reactions in living organisms. This fits.
• Option d: Protons are subatomic particles, not related to regulating reactions in living things. Eliminate.

Answer:

c. enzymes.