Question

When nucleotides link together in a series spiraling clockwise they form a

Answer 1

Nucleotides are joined together by covalent bonds between the phosphate group of one nucleotide and the third carbon atom of the pentose sugar in the next nucleotide. This produces an alternating backbone of sugar - phosphate - sugar - phosphate all along the polynucleotide chain.

Answer 2

The nucleotides form a Double Helix (also referred to as a twisted ladder).