Question

12.
In a DNA double helix the bases are held
together by hydrogen bonds. These
hydrogen bonds are
(A) Covalent bonds
(B) Non-covalent bonds
(C) Ionic bonds
(D) Van der Waals forces​

Answer 1

The DNA double helix has two types of bonds, covalent and hydrogen. Covalent bonds exist within each linear strand and strongly bond bases, sugars, and phosphate groups (both within each component and between components).