1. DNA STRUCTURE (REVIEW)
Miss Sofía Paz

2. A double-
stranded
nucleic acid
that contains
the genetic
information for
cell growth,
division, and
function
2 DNA
Deoxyribonucleic Acid
Polynucleotide:
built of nucleotides
(sugar,base, phosphate)
Nucleotide: organic molecule.
Building block of nucleic acids

3. Nucleotide

4. NUCELOTIDE
BASE
PHOSPHATE
)

5. Nucleotide

6. RNA
Cyclic nitrogen
containing molecule
with properties of a
base.
Organic compounds
DNA bases: A G C T
RNA bases: A G C U

7. DNA
 Nucleic acid (polymer, polynucleotide)

9. 9

10. Complementary Base Pairing And Hydrogen Bonds (DNA Double Helix )
 Base pairing: each type of nucleobase on one strand bonds with just
one type of nucleobase on the other strand
 Hyrogen Bonds: purines form hydrogen bonds to pyrimidines.
Adenine bonding only to Thymine in
two hydrogen bonds
Cytosine bonding only to Guanine in
three hydrogen bonds
Two nucleotides bonding together
across the double helix is called a
base pair.

11. Base pairing

12. DNA DOUBLE HELIX

13. 13

14. NucleosomeS
Is a segment of DNA
wound in a sequence
around eight histone
protein cores (octomer)
Nucleosomes form the fundamental units
of eukaryotic chromatin, which is used to pack the large
eukaryotic genomes into the nucleus while still ensuring
A nucleosome is the
basic unit
of DNA packaging
in eukaryotes