DNA - double helix shape -like a winding staircase. Composed of 4 bases Guanine (G) Cytosine (C) Adenine (A) Thymine (T) Always bond together A-T C-G Each base connected to the _______-_______ _________ Nucleotide = 1 sugar + phosphate + base (like adenine). DNA is complementary
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-double helix shape
-like a winding staircase
What is the complement to this single strand of DNA?
Watson and Crick – 2 scientists that figured out the
double helix shape of DNA.
-(although they actually used the work of other
scientists to figure it out)
that help a reaction occur.
Creates an exact copy! Each new strand has one of the original strands in it. Meselson Stahl experiment proved this.
the next nucleotide to bind is the oxygen off
the 3rd carbon (3’ carbon). The 5’ carbon
(the phosphate off it) from the nucleotide
being added is connecting to the open 3’ end.
All nucleotides are added to the 3’ end, thus
Polymerase goes in the 5’- 3’ direction.
Only the leading strand is read!