Final answer:
Cells use amino acids to make proteins, based on instructions from genes. The order of amino acids determines each protein's structure and function.
Step-by-step explanation:
Cells string together amino acids to make proteins. Genes provide the instructions to assemble these amino acids in a specific sequence which determines the function and structure of each protein. This process is a fundamental aspect of gene expression and protein synthesis, both of which are crucial to the functioning and continuity of life.