BIOL 101 Lecture Notes - Lecture 20: Intron, S Phase, Start Codon

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Dna replication goes through a semi conservated model (1 new synthesized strand and 1 old) Backbone of dna are sugar (deoxyrubose) and phosphate and are connected by hydrogen bonds which are between the bases. Bases of dna are a t c g. C bond to g with three bonds (harder to break apart) Helicase is the first enzyme that splits and unwinds the dna. Primase is the second enzyme that adds primer (an rna strand) onto a new template or strand (only thing that has u and rna strands) Now that the primer is added, dna polymerase is used as the third enzyme that adds dna bases to new dna bases from 5" to 3"/ other function is to remove primer and u. Ligase is the fourth enzyme that links strands and hydrogen bonds together glue to combine the two strands to become one strand. Lagging and leading strand: all go through the above enzyme.

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