1. DNA Replication

2. I. Nucleic Acids
• Built by repeating subunits called NUCLEOTIDES
• Process of DEHYDRATION synthesis chains them
together
DNA (deoxyribose nucleic acid)
RNA (ribonucleic acid)

3. II. Nucleotides have 3 parts
(review from Bio-A!!)
A. _PHOSPHATE group
B. 5 carbon SUGAR
C. _NITROGEN base
Phosphate Nitrogen Base 5 Carbon Sugar
DRAW THIS
& Label it!
Hydrogen Bond
Outside Inside Outside

4. There are 4 Nitrogen Bases
a. Adenine (A)
b. Thymine (T) –DNA, Uracil (U) – RNA
c. Cytosine (C)
d. Guanine (G)

5. Base Pairing Rule
• The bases pair up in a particular way like
pieces in a puzzle
a. _A-T in DNA or A-U in RNA
b. _C-G in both DNA and RNA

6. III. What is DNA?
• DNA shape is a double
helix
1. Deoxyribose sugar and
phosphate form the
OUTSIDE backbone
2. Pairs of nitrogen bases
form the rungs or
INSIDE of helix
• Two strands connected
by HYDROGEN bonds

7. • Functions:
–Contains the hereditary instructions to
make proteins that organisms need to
function

8. IV. DNA Replication
• The process of copying DNA in a cell
A. Once fertilization occurs and before cell
division can occur, a cell must make a copy of
its chromosomes so each new daughter cell
gets a full set of DNA

9. B. How it works: When a cell begins to
copy DNA during the S-phase
1. An enzyme separates and
UNZIPS the two sides of
DNA
2. The HYDROGEN bonds are
BROKEN between the
strands
• DNA can be transcribed to
RNA when this happens

10. 3. The DNA is read and each
complimentary base makes
BASE PAIRS
4. The REPLICATION process
produces TWO new strands
of DNA-each containing one
strand from the original
Video