Question

the x - ray diffraction pattern of dna discovered by rosalind franklin showed that dna
multiple choice
is neither pleated or helical but has a repeating pattern.
does not have a repeating pattern.
is both helical and has a repeating pattern.
is pleated.
is both pleated and has a repeating pattern.

Explanation:

Rosalind Franklin's X - ray diffraction image (Photo 51) was crucial in understanding DNA's structure. X - ray diffraction patterns can reveal the arrangement of atoms in a molecule. The pattern she obtained showed a helical structure (the cross - like pattern in the center is characteristic of a helix) and also indicated a repeating pattern (the regular spacing of the diffraction spots). DNA is not pleated (pleated structures are more common in some protein secondary structures like beta - pleated sheets).

Answer:

is both helical and has a repeating pattern.