Question

Which DNA variant has the widest helix diameter at 26 Å and occurs under dehydration conditions?

Options

• D-DNA

• C-DNA

• A-DNA

• Z-DNA

Answer 1

A-DNA is the widest variant with a helix diameter of 26 Å, making it noticeably wider than B-DNA's 20 Å. It forms under dehydration conditions and is shorter than B-DNA with a helix length of 28 Å compared to B-DNA's 34 Å. A-DNA contains 11 base pairs per turn.