I made one of these for my Biology class. It doesn't take very long and it looks pretty cool in the end. The one I made for school is colored. I've also made another one without using tools. Any way, here's what you need:
1 sheet of 8.5" by 11" paper
This can actually be done with any size of paper. This works best when the width of the sheet is around 8- 9 inches.
This could be used as a fun, cheap way to teach about DNA. Students would learn about the structure of a DNA strand and about how the four chemicals (Guanine, Adenine, Thymine, and Cytosine) combine in long complex structures to create the blueprints for what the cell makes.
NOTE: The DNA in the photos twists towards the left. As explained to me DNA actually spirals to the right. This is just a matter of which way you make your folds. Thanks to yardleydobon for pointing this out.
Step 1: Mark It Down the Middle
Step 2: Marking Out the Sugar- Phosphate Backbone.
Step 3: Marking Out Each Nitrogenus Base
Then make a line across each rectangle you just made. The lines on each side should point inward like a "V". As you can see, I accidentally did this wrong in the picture.
If you want to color it, this is the step to do it. Just split each rectangle in half and color each according to the Nitrogenus base.
Remember: Adenine -> Thymine and Guanine->Cytosine
To color the back bone, split each section on the sides and middle across the middle and alternate black and white.
Step 4: Fold It in Half
Step 5: Fold the Backbone
Step 6: Starting the Nitrogenus Bases.
Step 7: Flip It Over
Step 8: Fold the Diagonals
Step 9: Collapse the DNA
Step 10: Let Go!
Step 11: A Little About DNA
DNA stands for Deoxyribonucleic Acid. It resides inside the nucleolus, which is in the nucleus of Eukaryotic Cells. In Prokaryotic Cells DNA free floats due to the cell's lack of a membrane. It is the blueprints to the many things a cell creates. Each section of DNA is called a nucleotide. A nucleotide is made of one phosphate molecule, one deoxyribose sugar molecule and one nitrogenus base. There are four types of nitrogenus bases. Thymine, Adenine, Guanine and Cytosine. Thymine only bonds with Adenine. Cytosine only bonds with Guanine. The specific order of Nitrogenus bases determines what the strand creates. The deoxyribose sugar and the phosphate create the sugar-phosphate backbone. The reason DNA twists is because of how the 3 components in a nucleotide bonds. Nothing in nature is usually perfect, and the 3 components must warp to be able to create a bond.