 %G=%C and %A=%T  Rosalind Franklin was able to obtain a clear visible representation that the structure of the DNA was a double helix.

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Presentation transcript:

 %G=%C and %A=%T

 Rosalind Franklin was able to obtain a clear visible representation that the structure of the DNA was a double helix.

 Built a model of the double helix that conformed to Franklin’s research.

 produce DNA molecules that have 1 strand of parental DNA and 1 strand of new DNA.  This is called semi-conservative replication.

5’ 3’ 5’ 3’ DNA helicase Unwinds and unzips 5’ 3’ 5’ 3’ RNA primase Hey … nucleotides… match 3’ DNA Template strand Replication fork DNA polymerase Wks 5′ to 3′, removes primer, replaces w/ nucleotides ligase Glue.. Links P and sugar Leading strand Lagging strand Okasaki fragment

DNA helicase RNA primase

copied with less than one mistake in a billion nucleotides. This is equal to a person copying 100 large (1000 page) dictionaries word for word, and symbol for symbol, with only one error for the whole process!

Enzyme s Helicase Helicase …. unzips RNA primase RNA primase…. “primes” strand.. finds appropriate bases.. And puts temporary fill DNA Polymerase DNA Polymerase…. Wks 5’ to 3’, places nucleotides on template strand Ligase Ligase…. glue Other impt vocab Template strand Template strand…. Orig. DNA Leading strand Leading strand…. Replication fork Okasaki fragment Lagging strand Lagging strand….