Question

s polar covalent bondsDNA is made of two chains of nucleotides. Which type of bonds hold the chains together? hydrogen bonds covalent bonds ionic bonds polar covalent bonds

Answer 1

The right answr is hydrogen bonds

The hydrogen bond or hydrogen bridge is an intermolecular force involving a hydrogen atom and an electronegative atom such as oxygen, nitrogen and fluorine. The intensity of a hydrogen bond is intermediate between that of a covalent bond and that of van der Waals forces.

The helices of the DNA (both strands) are maintained by hydrogen bonds.

Answer 2

The DNA helix is held together by weak hydrogen bonds between the base pairs.