1. DNA Video

2. DNA Essential Question:
Why is DNA considered the building block of life?

4. What is DNA? DNA = Deoxyribose Nucleic Acid
Contains all the coding needed for living things.
An average person has between billion miles of DNA
Function is to store and transmit genetic information

5. Structure of DNA
Nucleotide- is the base unit of all nucleic acids; contains three parts
Deoxyribose (sugar molecule)
Deoxy- means that it contains less oxygen than a regular ribose
Phosphate
Nitrogen-containing base (4 of them)
A single gene is considered to be a complex polynucleotide unit
Composed of thousands of nucleotide units

6. Nitrogenous Bases Purines: 2 Ringed Pyrimidines: 1 Ringed Adenine (A)
Guanine (G)
Pyrimidines: 1 Ringed
Thymine (T)
Cytosine (C)

7. complementary base-pair rule:
GCAT
Guanine (G) + Cytosine (C)
Adenine (A) + Thymine (T)

8. Replication Structure explains process (strand serves as template)
Occurs prior to mitosis, meiosis, binary fission
Structure explains process (strand serves as template)
Enzymes unzip 2 chains of nucleotides
Forms complementary strand
End result = 2 exact copies !!

9. DNA and Chromosomes
Chromosomes ↓ Chromatin (DNA tightly coiled around proteins) ↓ ↓ DNA + Histones (protein molecule) Changes in the Chromatin structure and DNA-Histone bindings can lead to changes in gene activity and expression

10. DNA Activity Color Cut Paste
You should have 6 pairs of nitrogen bases (GCAT)
Phosphate and deoxyribose are the ‘backbone’ of the DNA
Please match up star with star; square with square; circle with circle