1.
The bases are on the (interior/exterior) of the double helix.
2.
They are arranged (randomly/neatly stacked).
3.
The phosphate groups are on the (interior/exterior) of the DNA molecule.
4.
The sugar groups on the (interior/exterior) of the DNA molecule.

1. The bases are on the interior of the double helix.

2.  They are arranged neatly stacked.

3.  The phosphate groups are on the exterior of the DNA molecule.

4.  The sugar groups on the exterior of the DNA molecule.

Explanation:

DNA is made up of basic chemical components called nucleotides. These basic components include a phosphate group, a sugar group and one of four types of alternative nitrogenous bases. To form a strand of DNA, the nucleotides unite to form chains, alternating with the phosphate and sugar groups.  

The four types of nitrogenous bases found in nucleotides are: adenine (A), thymine (T), guanine (G), and cytosine (C). The order, or sequence, of these bases determines which biological instructions are contained in a strand of DNA, being within the strands already mentioned.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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