Question

What is similar about the primary structure of RNA and DNA?

Short answer

The Similarity between DNA and RNA is that both are unbranched nucleotide chains linked by phosphodiester connections between alternating sugar and phosphate groups.

Step-by-step solution

Given information

We need to find similarity about the primary structure of RNA and DNA

Simplify

Nitrogenous bases, pentose sugar, and the phosphate backbone are all referred to as nucleotides.
DNA and RNA each have four nitrogenous bases, three of which are shared: cysteine, adenine, and guanine.
DNA and RNA are both unbranched nucleotide chains linked by phosphodiester connections between alternating sugar and phosphate groups, with bases extending out from each sugar.