Aim: How does DNA
Replicate?
1) Fill in the matching
bases:
• G• T• A• C• C• T-
• 2) Explain why DNA
replication has to
happen before mitosis
can occur?
Replication video clip
• http://www.dnatube.com/video/365/DNAReplication
Go over Replication Questions
DNA replication:
making an identical copy of a cell’s
DNA.
During DNA replication, the double
strand of DNA unzips, as weak H
bonds between the base pairs are
broken.
Complete the DNA Replication
Worksheet
DNA
• The chemical molecule
that makes up
chromosomes.
• http://www.brainpop.com
/science/cellularlifeandg
enetics/dna/
Aim: How can we describe the
structure of DNA?
•
•
•
•
1) What is a nucleotide?
2) What are the three parts of a nucleotide?
3) What is the shape of DNA called?
4) What 2 things make up the SIDES of the
molecule?
• 5) What 4 things make up the STEPS of the
molecule?
Aim: How does the structure of
DNA relate to its function?
Do Now:
• Color-Code “The Double Helix” Sheet
• Pick a different color for A C G and T
• Color P Black or Grey
• Leave D White
Do Now Review
• What do the letters C, N, and H, O, and P
represent?
• What are the lines between the letters?
Homework Review
• Go over Homework
Matching DNA Base Pairs
Fill in the “complementary” base pairs.
• C• A• G• T • C• C• A-
What does DNA do?
• What happens when it doesn’t work?
• What do you think happens when it DOES
work?
Aim: How can we model DNA
replication?
In-class lab
You will need:
• Paper
• Scissors
• Glue/Tape
• The Lab Sheet
Step 1
• Cut out the 6 nucleotides from the top of
the sheet only. Arrange them on the blank
sheet of paper, matching the nucleotides.
Your DNA should have 2 sides. Show
your teacher.
Step 2
Cut out the 4 nucleotides from the bottom of
the sheet. Arrange them on the blank
sheet under your first diagram.
Steps 3 and 4
• Fill in the base pairs for the replicating
DNA
• 1) Why is it important for DNA to replicate?
• 2) Why does A pair only with T?
Aim: How can we describe the
structure of proteins?
Do Now
• 1) How do the new strands of DNA
compare to the original strand after
replication?
• 2) What is the result of DNA replication?
Motivation
• Use the letters e, a, r, and d to
make as many words as you
can.
• Letters are used to make
.
• DNA is used to make
.
• How did DNA determine
your trait of skin color?
Protein Model
• How would you describe this model?
Amino Acids
• Amino Acids are the “building blocks”
of proteins.
• There are 20 kinds.
Proteins
• Made of Chains of Amino Acids.
• A polypeptide is a simple protein chain.
• Functions: enzymes, pigments, antibodies,
parts of cells and tissues.
• How does one protein differ from another?
Aim: How do genes make proteins?
Do Now:
• Complete the Learning Log using your
notes from last lesson.
Motivation
• Morse code had dots and dashes. What
about DNA?
Fill out the complementary base
pairs
• Gene #1
• Gene #2
Cell Diagram – Where are proteins
made?
How do we go from DNA code to
protein?
DNA vs. RNA
Genes
• A gene is a segment of DNA that codes for
a protein.
• Cells put proteins together one at a time.