1.
Look at the picture below and answer the following
questions.
2.
What do you think this picture is representing?
Write out all observable traits of this picture. (IE: The
lines connecting the two sides are different colors, etc).
3.
 Test
retakes are due today!
 http://now.msn.com/now-plus/0221-lebron-
dunk-kid-vid.aspx
 DNA


is a molecule that stores information
Carries all the information that a cell needs to
function, grow, and divide
HOWEVER, PROTEINS do the work.
 Proteins
are large molecules that are made
up of chains of amino acids.
 Amino Acids: proteins connected together.
1.
2.
3.
4.
Building cell parts
Repairing damage to the body
Fighting disease
Regulating the speed of chemical reactions
in the body (enzymes).
 DNA
stores the information that cells need to
make sure they put together the amino acids
in the right order. The order must be correct
in order to make proteins.
 Nucleotide
bases form the rungs of the
ladder.

Four nucleotides: adenine (A), thymine (T),
cytosine (C) and guanine (G).
All
Tigers
Can
Growl
 What



we’re going to be doing:
There is chart paper around the room.
Each person will grab a marker from me and then
find a place on the wall.
Once we are on the wall, I’ll be explaining
exactly what we are going to be doing.
 During
replication DNA strands are as
templates used to make copies of new
strands. Here is how it happens:
1. The DNA molecule opens up, separating
into two strands.
2. Nucleotides match up and join to the open
DNA strands.
3. Two identical DNA molecules are formed.
 Turn
to Page C137 and C138.
 Draw the diagram labeled replication at the
bottom of the page. Make sure you label it.
 You have 10 minutes.
 Hint: replication means to “repeat”
 With
a partner, answer the following
question
Describe the differences among DNA, genes
and Chromosomes.
How are they related?
Once you are done:
Turn to page C137 and C138 and copy the
pictures and label them in your notes. (25
pts)
 Genes
are units of heredity that are located
in DNA.
 DNA-molecules that stores information
(about your genetic make up)
 Chromosomes- this is the form that DNA
takes when cells divide. (DNA coils up into
chromosomes)
1.
2.
Describe the shape of the DNA molecule
and how the nucleotide bases fit into that
structure.
What is a protein and what is it made of?
 Let’s
decode our names!
 For each letter of the alphabet, geneticists
have assigned a specific codon (group of
three nucleotides.
 We are going to be using the list below and
write our the codon for our names.
Our Alphabet
A
Amino Acid Name
Simplified Codon
Alanine
GCT
B
GCA (Alanine)
C
Cysteine
TGC
D
Aspartic acid
GAT
E
Glutamic acid
GAG
F
Phenylalanine
TTT
G
Glycine
GGG
H
Histidine
CAT
I
Isoleucine
ATA
J
ATC (Isoleucine)
K
Lysine
AAG
L
Leucine
CTC
M
Methionine
ATG
N
Asparagine
GAC
O
GAT (Asparagine)
P
Proline
CCC
Q
Glutamine
GAG
R
Arginine
CGT
S
Serine
TCA
T
Threonine
ACT
U
ACG (Threonine)
V
Valine
GTC
W
Tryptophan
TGG
X
Y
Z
GTA (Valine)
Tyrosine
TAC
TAT (Tyrosine)
 Adenine




A.
B.
C.
D.
matches with __________________.
Thymine
Cytosine
Guanine
Uracine
 Cytonine




A.
B.
C.
D.
matches with _________________.
Thymine
Adenine
Guanine
Uracine
 What’s
the job of DNA?