意义-1中心法则补充--揭示第二套遗传密码 How DNA directs protein synthesis 1.Double-stranded DNA 2.Messenger RNA (mRNA) 3.Formation of protein in the cell nucleus forming on DNA strands on ribosome Strands of DNA"unzip' "Free"RNA nucleotide and allow "free"RNA approaches an"unzipped" The growing nucleotides to link DNA molecule to pair polypeptide with the separated u-g its base with DNA chain eventually constitutes a strands. nucleotide. 日Ac-8 protein. G4- alternating attached amino acid sugar and nbosome phosphate groups -U-A RNA mRNA moves from CGUACGAUCUGA the cell nucleus to a nbosome in the cytoplasm There it acts as a pattern on which amino acids nibosome moves transported by transfer RNA (tRNA)form protein. mRNA意义-1 中心法则补充--- 揭示第二套遗传密码 严禁复制