DNA Replication Enzymes
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10 Terms
Topoiomerase
Unwinds the DNA
Helicase
Breaks the hydrogen bonds between the nitrogenous bases
DNA Polymerase
Adds nucleotides to the growing DNA strand
Purines
Adenine and Guanine are this type of nitrogenous base; 2-ringed structure
Pyrimadine
Thymine and Cytosine are this type of nitrogenous base; single-ringed structure
Promoter
What the RNA polymerase attaches to on the DNA strand during transcription so that it knows where to start
Splicing
The process of removing introns from pre-mRNA
Exons
Sequences in the pre-mRNA and mRNA that code for the ultimate protein productsInt
Introns
Sequences in the pre-mRNA that are removed before the pre-mRNA can become mRNA
5’ cap and 3’ poly A tail
Protects the mRNA from degradation, promotes translation, regulates nuclear export of the mRNA
Note 
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