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?

http://www.youtube.com/watch?v=zwibgNGe4aY&feature=watch_response

A) Identify DNA and its functions.B) List three characteristics of DNA.C) Identify the three parts of a DNA nucleotideD) Describe DNA’s overall structureE) Use Chargaff’s rule to identify base pairs.F) Summarize DNA replication

Hereditary Instructions

Chemical code for every trait

“Blueprint” for making Proteins

A) Identify DNA and its functions.

What are its functions?

Deoxyribonucleic Acid

1. Organic molecule– made of carbon2. Nucleic acid

Obj. B) List three characteristics of DNA.

1. Nucleus2. Chromosomes

DNA

1. Nucleotidesa. Phosphate Groupb. Deoxyribose sugarc. Nitrogenous bases:Adenine-ThymineGuanine-Cytosine

Obj. C) Identify the three parts of a DNA nucleotide

A) Phosphate, Adenine, DeoxyriboseB) Deoxyribose, Phosphate, ThymineC) Phosphate, Ribose, ThymineD) Phosphate, Deoxyribose, GuanineE) Phosphate, Deoxyribose, and Uracil

Obj. C) Identify the three parts of a DNA nucleotide

1. Nucleotides

2. Ladder Shape

3. Double Helix = Watson and Crick’s Model

SugarPhosSugarPhosSugar

C-GT-AG-CA-T

Sides: Rotate Sugar Phosphate Group Sugar Phosphate GroupRungs: Attached to

sugar A-T T-A G-C C-G

Obj. E) Use Chargaff’s rule of base pairing to identify the complementary base in each pair.

GCATHydrogen Bonds

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

GCAT

Obj. E) Use Chargaff’s rule of base pairing to identify the complementary base in each pair.

Chromosomes double

When? Mitosis What stage? Interphase, S Phase 2n to 4n

2N

2N

Obj. F) Summarize DNA replication

1. DNA untwists2. Enzymes unzip DNA3. Enzyme – DNA Polymerase creates

corresponding base pairs4. DNA reforms 5. 2 strands twist into helix6. Result –

2 Identical StrandsEach = ½ original, ½ new Identical

Strand

Obj. F) Summarize DNA replication

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

2 Identical DNA strands

Nitrogen Bases

Prentice Hall DVD Disc

1. What is the name of the process where DNA copies itself?2. Name the three parts of a DNA nucleotide.3. Identify the complementary base for each of the

following:

4. According to Watson and Crick, what is DNA’s shape?

GuanineThymineAdenineCytosine

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.