1. Start-up for 1/8/14
You are going to watch a video titled “What is DNA?” As you watch the video, think about the following questions: What is DNA? Why is it important? What items comprise DNA?

2. Objectives: Students will
Biology Chapter 12-1 and 12-2
DNA and Replication, Pgs
Objectives: Students will
Identify DNA and its functions.
List three characteristics of DNA.
Identify the three parts of a DNA nucleotide
Describe DNA’s overall structure
Use Chargaff’s rule to identify base pairs.
Summarize DNA replication

3. Hereditary Instructions Chemical code for every trait
Identify DNA and its functions.
What are its functions?
What does DNA stand for?
Hereditary Instructions
Chemical code for every trait
“Blueprint” for making Proteins
Deoxyribonucleic Acid
Have students repeat Deoxyribonucleic acid several times.

4. 1. Organic molecule What is DNA? – made of carbon 2. Nucleic acid
Obj. B) List three characteristics of DNA.
What is DNA?
1. Organic molecule
– made of carbon
2. Nucleic acid
Where is it located?
1. Nucleus
2. Chromosomes X
DNA

5. DNA is a nucleic acid. What are the building blocks of nucleic acids?
Obj. C) Identify the three parts of a DNA nucleotide
DNA is a nucleic acid. What are the building blocks of nucleic acids?
1. Nucleotides
a. Phosphate Group
b. Deoxyribose sugar
c. Nitrogenous bases:
Adenine-Thymine
Guanine-Cytosine

6. A, B, D Obj. C) Identify the three parts of a DNA nucleotide
Given the following combinations, identify those that represent a nucleotide found in DNA.
A) Phosphate, Adenine, Deoxyribose B) Deoxyribose, Phosphate, Thymine C) Phosphate, Ribose, Thymine D) Phosphate, Deoxyribose, Guanine E) Phosphate, Deoxyribose, and Uracil
I want all of you to stand up, when I identify the correct combination of letters that represent DNA nucleotides you may sit down.
A, B, D

7. Obj. D) Describe DNA’s overall structure
Obj. E) Use Chargaff’s rule of base pairing to identify the complementary base in each pair.
Nucleotides
Ladder Shape
3. Double Helix = Watson and Crick’s Model
Sides: Rotate
Sugar
Phosphate Group
Rungs: Attached to sugar
A-T
T-A
G-C
C-G
Sugar
Phos
C-G
T-A
G-C
A-T
GCAT
Hydrogen Bonds

8. Identify the complementary base for each of the following:
Obj. E) Use Chargaff’s rule of base pairing to identify the complementary base in each pair.
Identify the complementary base for each of the following:
GCAT
1. Thymine
2. Cytosine
3. Guanine
4. Adenine
5. Cytosine
6. Guanine
7. Thymine
8. Adenine
1. Adenine
2. Guanine
3. Cytosine
4. Thymine
5. Guanine
6. Cytosine
7. Adenine
8. Thymine

9. What does it mean to replicate something?
Obj. F) Summarize DNA replication
What does it mean to replicate something?
COPY
Chromosomes double
When? Mitosis
What stage?
Interphase, S Phase
2n to 4n 2N 2N

10. Steps for DNA Replication:
Obj. F) Summarize DNA replication
Steps for DNA Replication:
DNA untwists
Enzymes unzip DNA
Enzyme – DNA Polymerase creates corresponding base pairs
DNA reforms
2 strands twist into helix
Result –
2 Identical Strands
Each = ½ original, ½ new
Identical
Strand

11. Answer the following questions while watching the video:
1. What two pieces of a nucleotide alternate as the backbone of DNA?
2. Of what are the DNA rungs comprised?
3. What is produced from replication?
Sugar (Deoxyribose) and Phosphate Group
Nitrogen Bases
2 Identical DNA strands
Prentice Hall DVD Disc

12. Understanding Check – Complete the following questions.
1. What is the name of the process where DNA copies itself?
2. Name the three parts of a DNA nucleotide.
Identify the complementary base for each of the following:
Guanine
Thymine
Adenine
Cytosine
4. According to Watson and Crick, what is DNA’s shape?
Complete Chapter 12-1 and 12-2 Link Word for homework.
You can answer #1-4 and part of #8 on your SBW from your current information.