Rosalind Franklin used very uniformly oriented DNA fibers prepared by Maurice Wilkins to perform X-ray crystallography. The diffraction pattern of X rays passing through the DNA fibers suggested all the following information about a DNA molecule except that it

a. is long.

b. is helical.

c. has nitrogenous bases on the interior.

d. is held together by hydrogen bonds.

e. is a constant thickness.

The correct answer is constant thickness.

Explanation:

A DNA double helix is long and contain nitrogen bases in the interior. The nitrogen base of one strand forms hydrogen boding with its complementary base of the other strand.

But DNA does not contain constant thickness because of its helical structure. If the DNA structure properly studied then one can notice that the thickness of some portion of DNA is more forming the major groove whereas the thickness of some particular region is less that generates the minor groove.