DNAReplicationNotes - Adenine(A pairs with...

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Replication of DNA DNA replication makes sure each daughter cell has the genetic  information it needs to carry out its activities! Rosalind Franklin used an X-Ray method to photograph DNA molecules,  and her photographs helped James Watson and Francis Crick figure out  the structure of DNA in 1953 DNA molecules look like a twisted ladder or spiral staircase The two side of the DNA ladder are made up of molecules of sugar called  deoxyribose and alternates with molecules of phosphates  (look at Figure  23 on page 101 in your textbook) Each rung is made up of a pair of molecules called  nitrogen bases Nitrogen Bases  – are molecules that contain the element nitrogen and  other elements DNA has 4 kinds of nitrogen bases: adenine (A), thymine (T), guanine  (G) and cytosine (C) The bases on one side of the ladder pair with bases on the other side
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Unformatted text preview: Adenine (A) pairs with Thymine (T) - - - - - (A) & (T) Guanine (G) pairs with Cytosine (C) - - - - - (G) & (C) The Replication Process: • DNA replication beings when the two sides of the DNA molecule unwind and separate, similar to a zipper unzipping – the molecules separate between the paired nitrogen bases • Nitrogen bases that are floating in the nucleus pair up with the bases on each half of the DNA molecule Each new DNA molecule exactly matches the order in the original DNA molecule because the way in which the nitrogen bases pair with one another - - A always with T - - - G always with C Once the new bases are attached, two new DNA molecules are formed!...
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This note was uploaded on 04/05/2011 for the course BIOL 2112 taught by Professor Deidra during the Spring '11 term at CSU Sacramento.

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DNAReplicationNotes - Adenine(A pairs with...

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