Answers

2015-12-07T19:45:05+08:00
Beacuse its look like zipper .. every molecule has a pair
1 4 1
2015-12-09T19:29:18+08:00
The structure of a zipper has two main features: a toothed track, and a zip. The DNA backbone is akin to the track, and an enzyme is able to unwind the backbone.
0