Noun | 1. | ![]() cistron, gene, factor - (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors" operon - a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene biochemistry - the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry base pair - one of the pairs of chemical bases joined by hydrogen bonds that connect the complementary strands of a DNA molecule or of an RNA molecule that has two strands; the base pairs are adenine with thymine and guanine with cytosine in DNA and adenine with uracil and guanine with cytosine in RNA adenine, A - (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA cDNA, complementary DNA - single-stranded DNA that is complementary to messenger RNA or DNA that has been synthesized from messenger RNA by reverse transcriptase episome - DNA that is not incorporated into the genome but is replicated together with the genome (especially in bacterial cells) coding DNA, exon - sequence of a gene's DNA that transcribes into protein structures; "exons are interspersed with introns" intron, noncoding DNA - sequence of a eukaryotic gene's DNA that is not translated into a protein junk DNA - stretches of DNA that do not code for genes; "most of the genome consists of junk DNA" recombinant deoxyribonucleic acid, recombinant DNA - genetically engineered DNA made by recombining fragments of DNA from different organisms sticky end - an end of DNA in which one strand of the double helix extends a few units beyond the other jumping gene, transposon - a segment of DNA that can become integrated at many different sites along a chromosome (especially a segment of bacterial DNA that can be translocated as a whole) nucleic acid - (biochemistry) any of various macromolecules composed of nucleotide chains that are vital constituents of all living cells polymer - a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers |