A set of three-nucleotide-long words that specify the amino acids for polypeptide chains. triploblastic Possessing three germ layers: the endoderm, mesoderm, and ectoderm. Most eumetazoa are triploblastic. trophic level[Gk. trophos, feeder] The division of species in an ecosystem on the basis of their main nutritional source. The trophic level that ultimately supports all others consists of autotrophs, or primary producers.

the normal version of the genetic code in which a sequence of three nucleotides codes for the synthesis of a specific amino acid

a sequence of three bases along a single strand of DNA

A group of three nucleotides in a DNA molecule that codes for a specific amino acid in the protein product of that DNA. Also called a codon. ( Students should be familiar with the relationships between the triplet code on DNA, the corresponding bases on mRNA and the eventual translation of this code into an amino acid in a polypeptide chain. This information will be found in any Biology text.) Back to the top of this page U - Z

A code in which a given amino acid is specified by a set of three nucleotides.