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Nitrogenous Base a carbon ring structure that contains one or more atoms of nitrogen Double Helix the shape that DNA composed of two strands twisted together makes Replication the process where the chromosomes is copied mRNA brings instructions from DNA in the nucleus to the cell's factory floor(the cytoplasm) rRNA binds the mRNA and uses the instructions to assemble the amino acids in the correct order tRNA is the supplier, delivers amino acids to the ribosomes to be assembled into a protein Transcription the process that enzymes make an RNA copy of a portion of a DNA strand Codon the groups of three nitrogenous bases in mRNA code for one amino acid Translation the process of converting the information in a nitrogenous base in mRNA into a sequence of amino acids in protein Mutation any change in the DNA sequence Point Mutation a change in a single base pair in DNA Frameshift Mutation single base is added to or deleted from DNA Chromosomal Mutations structural changes in chromosomes Mutagen agent that can cause a change in DNA