A) by X-ray mutagenesis of Neurospora chromosomes
B) by isolating chromosomes from the pea plants used by Mendel
C) using unusual, abnormally large chromosomes from Drosophila
D) using X-ray crystallography to examine chromosome structure
E) by examining mutations in sperm and egg chromosomes

A) The scattering of X rays by a purified form of a molecule reveals its structure.
B) DNA strands are separated by X-ray energy, revealing the order of bases.
C) Cells are broken open to release chromosomes by being bombarded with X rays.
D) The X rays are used to mutate DNA, to determine the location of genes.
E) Enzymes are destroyed by X rays, revealing the order of steps in metabolism.

A) relied heavily on the experimental results of others.
B) did extensive experimentation.
C) were unaware that others were also seeking the structure of DNA.
D) had strong evidence that DNA was a protein.
E) were hired by laboratories specifically to study DNA.