DNA Codes for the Sequence of Amino Acids in the Primary

Multiple Choice

DNA codes for the sequence of amino acids in the primary structure of a protein,but not for sugars or lipids.This is because

A) only proteins are involved in living metabolic reactions.
B) sugars and lipids code for their own replication.
C) sugars and lipids are ever present in the living environment and are not used in living structures.
D) other hereditary molecules code for sugars and lipids.
E) proteins are the main structural and functional components of cells.