The link of DNA to the making of proteins was figured out by Khorana and Nirenberg in 1966. What did they discover that cracked the genetic code? a)monoclonal antibody technology based on the use of hybridomas b)that DNA was the hereditary material that was transferred c) the 64 codons that code for the 20 amino acids making up proteins d) the structure of DNA as the hereditary material was a double helix