Question

If a DNA molecule were compared to a spiral staircase, which parts would make up rails of the staircase.

Answer 1

Railings of the staircase, are made of deoxyribose sugars alternating with phosphates.

• The structure of DNA is a double helix. In other words, it is a double stranded molecule that twists like a spiral staircase.
• The outsides of the molecule, the railings of the staircase, are made of deoxyribose sugars alternating with phosphates.
• This part of the molecule is sometimes called the "backbone".