DNA Notes

Chromosomes Made of DNA and protein

What does DNA look like?

DNA = Deoxyribonucleic Acid Made up of nucleotides Phosphate Sugar (deoxyribose) Base 4 types Adenine (A) Guanine (G) Thymine (T) Cytocine (C)

A nucleotide:

Chemically it looks like:

Scientific Contributions

Erwin Chargaff Amount of Adenine = Amount of Thymine Amount of Cytosine = Amount of Guanine

Rosalin Franklin Used x-ray diffraction & learned…. DNA is spiral shaped

James Watson & Francis Crick Created the first model of DNA

The Twisted Ladder shape is called a…… Double Helix

Review: Which of the following is not part of a nucleotide? a. base b. sugar c. fat d. phosphate

If a sample of DNA contained 20%cytosine, what percent of guanine would be in the sample?___________ What percent of adenine would be in the sample? ___________________

What would be the complimentary strand of DNA for this strand: ATG GTA

James Watson and Francis Crick…. a. Took X-ray pictures of DNA b. Discovered that genes are in chromosomes c. Made model’s to figure out DNA’s shape d. Bred pea plant’s to study heredity

Create your own segment of DNA Color code your molecules! Rules: 1. Phosphates attach to sugars only 2. Sugars attach to phosphates & bases 3. Bases attach to sugars and with other bases, but… *Adenine will only pair with Thymine *Guanine will only pair with Cytosine One strand of DNA goes 3’ to 5’ while the other goes 5’ to 3’…that means one side is up side down! 5. Your strand must have 10 nucleotides!