Biology 12 unit 4 molecular genetics DNA Structure
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12 Terms
The monomer of DNA is a…
nucleotide
A nucleotide consitsts of:
Phosphate group
Deoxyribose (a sugar)
Nitogenous base
The two sides to a nucleotide.
The phosphate group is attached to the 5' carbon.
A hydroxyl group (-OH) is attached to the 3' carbon.
Nucleotides join together by…
dehydration synthesis. or condesation rxn
A polymer of nucleotides make up a…
a singular molecule of DNA
There are how many strands of DNA in a DNA molecule?
2
The sides of the DNA molecule consist of:
alternating sugar and phosphate. also called a Called a sugar phosphate backbone.
The center of the DNA molecule has the…
contains the nitrogenous bases.
Base Pairings are:
The nitrogenous bases hydrogen bond to each other.
the two types of nitrogenous bases.
Purines Adenine(A) and Guanine (G) Pyrimidines Thymine (T) and Cytosine ( C )
Base Pairing Rules
A Purine bonds to a Pyrimidine
Adenine + Thymine (Two hydrogen bonds)
Guanine + Cyotosine (Three hydrogen bonds)
Anti-parallel means:
The sugar phosphate backbones of DNA run in opposite directions
One side runs 5’ to 3’
The other side runs 3’ to 5’
Note 
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