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watsona nd crick

created a model of DNA

double helix

made of 2 nucleotide strands that wrap around each other in the shape of a double helix

DNA nucleotide

made of a 5 carbon deoxyribose sugar, a phosphate group, and one of 4 nitrogenous bases, adenia, guanina, cytosina, or thymine

complimentary bases

hydrogen bonding between the complementary base pairs, G-A and A-t, holds the two strands of a DNA molecule together

DNA replication

the proces by which DNA is copied in a cell before a cell divides


an enzyme that seperates DNA strands

DNA polymerase

an enzyme that catalyzes the formation of the DNA molecule

semi-conservative replication

each new DNA molecule is made of one strand of nucleotides from the original DNA molecule and one new strand

replication fork

the site at which the DNA seperates and new nucleotides come in to make the new strand of DNA

messenger RNA

carries the genetic message from the nucles to the cytosol

ribosomal RNA

the major component of ribsomomes

transfer RNA

carries specific amino acids, helping to form polypeptides


DNA acts as a template for directing the synthesis of RNA


making a protein from the RNA which was made from DNA


in DNA, a three nucleotide sequence that encodes an amino acid or signifies a start signal or a stop cavity

amino acid

an organic molecule that contains a carboxl and an amino group and that makes up proteins

human genome

the complete genetic content

RNA has the sugar ribose

DNA has deoxyribose

RNA has uracilis

DNA has thymine

RNA is single stranded

DNA is longer than RNA

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