DNA Structure & Function. Biology 12. Functions of DNA. Controls cellular functions Central Dogma – DNA makes … DNA (replication) RNA (transcription) Protein (translation). DNA. DNA. Central Dogma of molecular biology!. RNA. RNA. Protein. Protein. Structure of DNA.
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Parallel but in opposite directions
5’ end of one strand of DNA aligns with 3’ end of the other strand
#1 - attaches to nitrogenous base
#3 - attaches to phosphate
#5 - attaches to phosphate
Why do you think the bases match up this way?
Purine + Purine = toobig
Pyrimidine + Pyrimidine = toosmall
Purine + Pyrimidine = just right!
5’ C A G T 3’
3’ G T C A 5’