![Page 1: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/1.jpg)
DNA Structure
![Page 2: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/2.jpg)
OBJECTIVES
• Describe 3 parts of a NUCLEOTIDE
• Describe a DNA molecule
• Demonstrate COMPLIMENTARY base pairing
![Page 3: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/3.jpg)
DNA is Genetic Material
• DNA stands for: DEOXYRIBONUCLEIC ACID
– Controls protein production in cells
– Made up of many genes which control traits
![Page 4: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/4.jpg)
Why DNA is Important
• Passes genetic information from generation to generation
• Traits are controlled by DNA
• DNA replicates with little error
• Can’t live with out DNA because it part of everything in the body
![Page 5: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/5.jpg)
DNA structure
• DNA is a double Helix • Meaning DNA has two
strands. It looks like a twisted ladder
• DNA is polymer made up of units called NUCLEOTIDES
PO4
![Page 6: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/6.jpg)
DNA StructurePO4
PO4
PO4
PO4
A molecule of DNA is formed by millions monomers called nucleotides joined together in a long chain
![Page 7: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/7.jpg)
Nucleotide Structure3 important parts:
1. Phosphate group
2. Sugar (Deoxyribose)
3. Nitrogenous base (G,C,A,T)
Phosphate &
sugar m
ake up
the “back
bone”.
![Page 8: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/8.jpg)
4 Nitrogenous Bases
ADENINE (A)
THYMINE (T)
CYTOSINE (C)
GUANINE (G)
![Page 9: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/9.jpg)
2 PURINES
The PURINES form hydrogen bonds with the PYRIMIDINES
![Page 10: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/10.jpg)
PYRIMIDINES
![Page 11: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/11.jpg)
Base Pairing
ADENINE always pairs with THYMINE
CYTOSINE always pairs with GUANINE
Notice the number of hydrogen bonds formed
![Page 12: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/12.jpg)
DNA structure
Each strand is COMPLEMENTARY to the other
![Page 13: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/13.jpg)
Complementary Strands
• If we know the DNA sequence of one strand, we can predict the DNA sequence of it’s complement
PO4
PO4
PO4
PO4
PO4
PO4
PO4
PO4
C C GG A AT T
PO4
C
PO4
CPO4
A
PO4
A
PO4
T
PO4
T
PO4
G
PO4
G
![Page 14: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/14.jpg)
DNA Structure• DNA strands are
ANTI-PARALLEL– Phosphates run in
different directions
![Page 15: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/15.jpg)
What to do next
• Complete worksheet in class
• When done call me over so I can stamp your sheet
• Homework: BRING YOUR BOOK TO CLASS!!
![Page 16: DNA Structure. OBJECTIVES Describe 3 parts of a NUCLEOTIDE Describe a DNA molecule Demonstrate COMPLIMENTARY base pairing](https://reader035.vdocuments.net/reader035/viewer/2022062720/56649ef65503460f94c0a6f1/html5/thumbnails/16.jpg)
Replication
• http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter14/animations.html#