DNA STRUCTURE
4 BASES
What are my four bases?
Adenine, Guanine, Cytosine, and Thymine
WHAT IS MY SAYING TO REMEMBER BASE
PAIRS?

Apples in the Tree, Cars in the Garage
BASE PAIRS
What are my base pairs?
A-T
C-G
NUCLEOTIDES
What three parts make up
a nucleotide?
Sugar, Phosphate,
Base
Purine =A&G
Pyrimidine=C,T&U
ANTI PARALLEL STRUCTURE
On one side of
the DNA, ALL
nucleotides
must be flipped
in order for the
base pairs to
match up in the
middle of the
DNA
Dependent on which carbon
on the sugar molecule the
phosphate is attached to.
RNA
FOUR BASES
What are my four bases
for RNA?
Adenine
Guanine
Uracil
Cytosine
PYRIMIDINE AND PURINE BASES OF RNA
Pyrimidines
Uracil
Cytosine
Purines
Adenine
guanine
RNA NUCLEOTIDE
-Uses Ribose as the sugar
-Uses uracil, not thymine as a base
-three parts: sugar, phosphate, base
RNA STRUCTURE
-Single Stranded
-uses uracil, adenine, cytosine, and
guanine
-sugar is ribose
SIMILARITIES AND DIFFERENCES
SIMILARITES
Both have 4 bases
 They both have A, G, C
 Same three parts of the nucleotide: sugar,
phosphate, base
 Both have a backbone

DIFFERENCES BETWEEN RNA AND DNA