DNA Structure
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How is DNA arranged?
It is tightly coiled and packaged with associated proteins
What does DNA carry?
The genetic code for inheritance.
What is the shape of DNA?
A double Helix
How are two DNA strands held together?
Hydrogen Bonds
The strands run in opposite directions. What is the term used to describe this arrangement?
Antiparallel
What end is the hydroxyl
3’
What end is the phosphate group
5’
What is a nucleotide composed of
Deoxyribose, phosphate and a base
What are the four bases found in DNA
Adenine, Thymine,Cytosine, Guanine
Name the base pairs.
Adenine and Thymine Guanine and Cytosine
Describe the process of replication.
• DNA is unwound and unzipped to form two template strands • DNA polymerase needs a primer to start replication and can only add complementary DNA nucleotides to the deoxyribose (3’) end of the DNA strand • This results in one strand being replicated continuously and the other strand replicated in fragments which are joined by ligase.