Answer:
an A- A pair is wider than a CC pair.
Explanation:
One of the great scientists that worked on how the structure of Deoxyribonucleic acid is is the chemist called Rosalind Franklin. The Deoxyribonucleic acid can be divide into three main, namely: the nitrogen base[ that is the adenine, guanine, cytosine and the thymine], the phosphate and the deoxyribose.
From Franklin's work, it was shown that the Deoxyribonucleic acid is a structure composing of double helix with both having the adenine, guanine, cytosine and the thymine. The diameter will not be the same because there is the case of Adenine- Adenine being wider than Cytosine- Cytosine.
X-ray crystallography is the experimental science technique used to determine the crystal and molecular structure of a compound.
The uniform diameter can rule out base pairing between nucleotides because of the difference in the base pairing of nitrogenous bases.
The correct statement is:
The X-ray crystallography data suggested DNA is double-stranded and has a uniform diameter. These observations can be used to rule out base pairing between two of the same nucleotide because of the difference in the bonds of nitrogenous base pairing.
Rosalind Franklin was one of the greatest scientists who worked on the crystalline structure of DNA.
The experiment showed that DNA is made up of nitrogenous base pairs, a sugar molecule, and a phosphate backbone.
The structure showed that adenine, guanine, cytosine, and thymine were the four base pairs, which were bonded by double or triple bonds.
Thus, the diameter of the DNA will not be uniform because of the difference in the type of bonds present between base pairs.
To know more about DNA structure, refer to the following link:
https://brainly.com/question/22499464
