Nucleic acids store, transmit, and help express hereditary information. Nucleic acids: polymers made of monomers called nucleotides. Amino acid sequence of a polypeptide is programmed by genes. Genes consists of dna which belong to nucleic acids. Dna: the genetic material that organisms inherit from their parents. Both enable living organisms to reproduce their components from one generation to the next. Dna provides directions for its own replication and directs rna synthesis and through. Rna, controls proteins synthesis; this is called gene expression. Each chromosome contains one long dna molecule (usually carrying several hundred or more genes) When a cell reproduces by dividing, its dna is coped and passed on. Encoded in dna is the information that programs all the cell"s activities. Dna is not directly involved in running the operations of the cell, proteins are required to implement genetic programs. Each gene along a dna molecule directs synthesis of a mrna.