12-2 DNA Replication
The DNA Double Helix
DNA Replication
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the process by which DNA makes a
copy of itself
occurs during interphase, prior to cell
division
each new cell receives a copy of the
DNA
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The 2 strands of DNA
are complementary.
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T always pairs with A
G always pairs with C
Steps of DNA Replication
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1. DNA helicase (enzyme) unwinds the
DNA.
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The junction between the unwound part and
the open part is called a replication fork.
2. DNA polymerase adds the
complementary nucleotides.
Steps (continued)
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3. DNA polymerase adds
complementary
nucleotides on the other side
of the ladder.
4. DNA polymerase goes
back and proofreads the
DNA strands.
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Fixes errors in DNA sequence.
http://www.stolaf.edu/people/giannini/flashanimat/molgenetics/dna-rna2.swf
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You Tube video 1 min. clip
Bozeman Biology
Video