What molecule carries the code for making more DNA, making proteins, and making RNA?
Your answer is DNA. DNA carries the code for making more DNA through DNA replication, where the double helix is unzipped and each strand used to make a complementary strand, ending with two identical double helixes. The fundamental idea of biology involves DNA coding into mRNA by kind of the same process as DNA replication, but mRNA bases are used instead of DNA bases. The mRNA is then put into ribosomes and with the help of tRNA, amino acid chains are built from the mRNA code. Since amino acid chains fold into proteins, DNA is the one molecule which effectively codes for all three processes.
