Question

directions: match the scientist to their contribution about dna by dragging their name next to their discovery.
findings\tscientist
in 1953, they concluded that the dna molecule appears as a three - dimensional double helix.
used x - ray crystallography to study dnas structure, which helped watson & crick with their discovery
determined the base pairings rule for dna (a - t and g - c)
erwin chargaff\twatson & crick\trosalind franklin

Explanation:

1. Watson & Crick concluded in 1953 that DNA is a three - dimensional double helix.
2. Rosalind Franklin used X - ray crystallography to study DNA's structure, aiding Watson & Crick.
3. Erwin Chargaff determined the base - pairing rules (A - T and G - C) for DNA.

Answer:

1. In 1953, they concluded that the DNA molecule appears as a three - dimensional double helix: Watson & Crick
2. Used X - ray crystallography to study DNA’s structure, which helped Watson & Crick with their discovery: Rosalind Franklin
3. Determined the base pairings rule for DNA (A - T and G - C): Erwin Chargaff