10 DNA Double Helix 2 strands wrapped around each other Strands are twisted because of the bonding of pyrimidines to purines
11 DNA Double Helix Strands are oriented in opposite directions 3’ to 5’ OR 5’ to 3’
12 Function of DNA DNA contains coded instructions for making proteins. DNA can be copied, but that does NOT explain how a gene works.DNA contains coded instructions for making proteins.The first step of making proteins is decoding the genetic messages by copying the nucleotide sequence from DNA into RNA.
16 RNA Single Helix 1 twisted strand 3 Types mRNA — Messenger RNA tRNA — Transfer RNArRNA — Ribosomal RNA
17 Functions of RNAIn most cells RNA molecules have just one job — protein synthesis.All 3 types of RNA are involved in protein synthesis.Amino acids are the building blocks of proteins.The assembly of amino acids is controlled by RNA.
18 mRNAMessenger RNA serve as messengers from DNA to the rest of the cell.They carry copies of the instructions found on genes.
19 tRNAtRNA takes the messages from mRNA and decodes them for the ribosome.During the construction of a protein, transfer RNA transfers each amino acid to the ribosome.
21 rRNA Proteins are assembled on ribosomes. Ribosomes are made up of ribosomal RNA.Ribosomal RNA helps build the actual protein.rRNA puts together the amino acid messages carried by mRNA and decoded by tRNA.