STRUCTURE OF DNA
http://iespoetaclaudio.centros.educa.jcyl.es/sitio/upload/nucleo_cromosomas_adn4eso.pdf
REPLICATION:
http://biomodel.uah.es/biomodel-misc/anim/replic/replic7.html
TRANSCRIPTION:
http://www.johnkyrk.com/DNAtranscription.esp.html
TRANSLATION:
http://www3.uah.es/biomodel/biomodel-misc/anim/traduc/traduc5.html
