Topics: Nucleic acid metabolism, nucleic acid, nitrogen bases, pentoase sugars, Nucleosides, Nucleotides, RNA, DNA, DNA Double Helix, DNA Replication, Ribonucleic Acid, Ribosomal RNA, Messenger RNA, Protein Synthesis, transfer RNA, Transcription, RNA Polymerase, Prokaryotic Transcription, Lactose Operon, lactose Repressor, genetic code