Question

which letters collectively make up a nucleotide. select all that apply

Explanation:

A nucleotide consists of a phosphate group, a sugar molecule, and a nitrogen - containing base. In a DNA structure representation like this, typically the phosphate is represented by a small circle (could be associated with a letter like W which might represent the phosphate), the sugar by a pentagonal shape (could be X), and the base by a letter like A, T, C, G (Y could be part of the base - sugar - phosphate complex).

Answer:

W, X, Y