Roche A. Samy
Present concept of DNA structure activity can be encouraged to be drawn by students with different color pens or pencils. The sugar-phosphate backbones of the double helix are represented as ribbons and the steplike base pairs are connected as planks. In (A) DNA, the student can draw the base pairs which are tilted and are pulled away from the axis of the double helix.
In (B) DNA, on the opposite side, the base pairs sit astride the helix axis and are perpendicular to it.
This activity is ideal for Capsule Lesson 3.
