2. The double-helix model of DNA
The double-helix model of DNA is shown here. One strand points upward in the 5’ to 3’ direction. In the image, label which direction the other arrow points.
A Hydrogen bonds between bases on opposite strands hold this DNA helix together. How many hydrogen bonds form between a single guanine (G) and its complementary base?
Examine the distance between base pairs and the length of one full twist of the double helix. How many base pairs long is one full twist of the helix?
15
1
5
10