In what ways is the structure of mRNA similar to the DNA

1) Both have pentose sugar (sugar is slightly different in DNA being a deoxyribose but still a pentose sugar)

2) Both mRNA and DNA have sugar and phosphate backbones, and nitrogenous bases.

3) mRNA and DNA have Adenine, Guanine, and Cytosine as similar nitrogenous bases.

4) Both are crucial in central dogma of life (this is the process of DNA-->mRNA--> protein) or you could say both are crucial to produce an enzyme or protein ...

the list goes on and on

They are similar by them being similar period