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final 1 bio 101
final 1
7
Biology
Undergraduate 2
05/06/2012

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Term
Primase
Definition
An enzyme that joins RNA nucleotides to make a primer during DNA replication, using the parental DNA strand as a template.
Term
DNA Polymerase I and III
Definition
An enzyme that catalyzes the elongation of new DNA by the addition of nucleotides to the 3' end of an existing chain. There are several diff. DNA polymerases; DNA polymerase III and DNA polymerase I play major roles in DNA replication in E. coli.
Term
Antiparallel replication
Definition
Referring to the arrangement of the sugar-phosphate backbones in a DNA double helix. (They run in opposite 5' 3' direction)
Term
Telomeres
Definition
The tandemly repetitive DNA at the end of a eukaryotic chromosomes DNA molecule. Telomeres protect the organisms genes from being eroded during successive rounds of replication.
Term
Origin of Replication
Definition
Site where the repl8ication of a molecule begins. Consisting of a specific sequence of nucleotides.
Term
Okazaki Fragments
Definition
A short segment of DNA synthesized away from the replication fork on a template strand during DNA replication. Many such segments are joined together to make up the lagging strand of newly synthesized DNA.
Term
RNA Primer
Definition
A short stretch of RNA with a free 3' end, bound by complementary base pairing to the template strand & elongated with DNA nucleotides during DNA replication.
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