Question

The diameter of B-DNA was found to be 20Å by the study of

• A. Erwin Chargaff's conclusions
• B. Meselson and Stahl's experiment
• C. Franklin and Wilkins' X-ray diffraction studies
• D. Watson and Crick's three dimensional model

Answer 1

The correct option is C Franklin and Wilkins' X-ray diffraction studies

The diameter of the B-DNA was found to be 20Å, by the X-ray diffraction data of DNA fibers taken by Rosalind Franklin and Maurice Wilkins. Watson and Crick used their study to construct the 3-D model of B-DNA.

Erwin Chargaff's studies on DNA gave conclusions about the compositional ratio of different nitrogenous bases in the double-stranded DNA molecule.
Meselson and Sthal's experiment proves the semi-conservative nature of DNA replication.