The correct responses regarding the purpose of DNA are:
A. manufactures proteins C. stores hereditary information
DNA primarily serves as the genetic blueprint for the synthesis of proteins (option A) and it stores hereditary information (option C) that is passed from one generation to the next.
Options B and D do not accurately describe the primary purposes of DNA. Option B relates to enzymes and biochemical reactions, and option D pertains to a transport mechanism across cell membranes.