How is DNA similar to RNA? *

Both have a helix-like structure(DNA is a double helix, RNA is a single helix), both use Adenine, Guanine, and Cytosine for their base pairs(Uracil is in place of thymine in RNA), and lastly both have a phosphate, base pair, and sugar for their basic structure. RNA uses Ribose and DNA uses Deoxyribose. Also, both can be unzipped by helicase to create replicas, though this is more common in DNA. I hope this helps.

your answer is "the 1950's"