Question

analyzing dna structure

1. watson and crick made a successful model of dna

based on rosalind franklins x - ray studies. this
indicated that dna was
a. a triple helix with intertwined bases.
b. a double helix with bases outside the helix.
c. a double helix with bases inside the helix.
d. a single linear molecule of bases held
together by sugar - phosphate bonds.

Explanation:

Rosalind Franklin's X-ray crystallography images of DNA (like Photo 51) revealed a helical structure with a consistent diameter. Watson and Crick used this data to deduce that DNA is a double helix, where the complementary nucleotide bases pair up and are positioned on the inside of the helix, with the sugar-phosphate backbones forming the outer framework.

Answer:

C. a double helix with bases inside the helix.