Final answer:
Folic acid is ultimately used in the synthesis of coenzymes required for various biochemical reactions in the body, including DNA synthesis.
Step-by-step explanation:
Folic acid is ultimately used in the synthesis of coenzymes. Coenzymes are organic molecules that work with enzymes to facilitate the function of various biochemical reactions in the body. Folic acid is converted into tetrahydrofolic acid, which is then used to produce coenzymes needed for one-carbon transfer reactions essential for the synthesis of DNA, proteins, and other important molecules.