the purine bases: adenine and guanine .... the pyrimidines bases: cystosine and thymine. a nucleotide or mononucleotide is composed of phosphate, sugar, and base. the bases are held together by hydrogen bonds, forming the double helix.
transcription: dna replication. 1) the double helix unwinds, this happens because of the enzyme helicase and the hydrogen bonds are broken. 2) the strands act as templates. the exposed act attract new bases. 3) DNA polymerase and ligase 4) MRNA is formed.
Gene therapy is when a faulty allele is replaced with a healthy allele. germ line threapy can be passed on to future generations, could lead to designer babies,
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