1. DNA Paper Model
Imagine DNA is a twisted ladder. The outside of the ladder is made up of alternating sugar and phosphate molecules. The sugar is called deoxyribose. The rungs of the ladder are made of a pair of molecules called nitrogen bases. There are four nitrogen bases in DNA: adenine, guanine, cytosine, and thymine. Because of the chemical structures of the bases, adenine only pairs with thymine, and cytosine only pairs with guanine to form a rung.

2. STEP 1:
Each group member should receive one sheet of phosphate molecules and one sheet of deoxyribose molecules.
Each group member will receive a different sheet of nitrogen bases.
Color the molecules:
Deoxyribose = Orange
Phosphate = Purple
Adenine = Red
Thymine = Green
Cytosine = Yellow
Guanine = Blue
Cut out the molecules.

3. STEP 2:
Arrange your molecules to make nucleotides that each include one phosphate molecule, one deoxyribose molecule and one nitrogen base.
Using a SMALL piece of tape, attach the nitrogen base molecule to the sugar molecule by matching up the dots.
Using a SMALL piece of tape, attach the phosphate molecule to your model by matching up the stars.

4. A-T-T-C-C-G-T-A-G-C STEP 3:
Arrange your nucleotides to create a strand that reads:
A-T-T-C-C-G-T-A-G-C
Using a SMALL piece of tape, attach the phosphate molecules to the sugar molecules by matching up the squares.

5. STEP 4:
Using a SMALL piece of tape, attach the complimentary nucleotides to the DNA strand you created.
Using a SMALL piece of tape, attach the phosphate molecules to the sugar molecules by matching up the squares to complete your DNA strand.

6. STEP 5:
Bring your DNA strand to Mr. ague to join up with other lab group’s models.