Question

that DNA is a double helix structure was proposed by

Answer 1

Answer:Francis Crick

In 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they called a "double helix," in the journal Nature. For this breakthrough discovery, Watson, Crick, and their colleague Maurice Wilkins won a Nobel Prize in Physiology, or Medicine, in 1962.

Explanation:

Answer 2

Francis Crick and James Watson discovered the double helix structure of DNA.