A- DNA

 B-DNA

 C-DNA

• low humidity form, hence can be created from B-DNA by reducing the humidity of a B-DNA sample

• requires 92 % humidity

• Can be obtained from B- DNA with sequence CGCGCG by increasing the alcoholic or salt concentration.

• has shortest helix which makes a turn over @ 2.3 nm

• @ 3.4 nm

• @ 4.6 nm

• helix diameter- 25.5 Å

• 20 Å

• 18.9 Å

• right handed helix

• right handed helix

• left handed helix

• base pairs are slanted to the helix axis

• base pairs are perpendicular to the helix axis

• base pairs are perpendicular to the helix axis

• Repeating unit is one base pair

• Repeating unit is one base pair

• Repeating unit is 2 base pairs

• rotation per base pair is 33.6 degrees

• rotation per base pair is 35.9 degrees

• rotation per 2 base pair is 60 degrees

• Inclination of base pair to helix = +19 degrees

• Inclination of base pair to helix = - 1.2 degrees

• Inclination of base pair to helix = -9 degrees