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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

9. The scientific data that directly provided Watson and Crick with the structural dimensions and helical nature of DNA was derived from

A. Protein sequencing
B. X-ray diffraction images
✓
C. Paper chromatography
D. Electron microscopy

📝 Explanation

Rosalind Franklin’s famous "Photo 51" obtained via X-ray crystallography revealed the helical configuration and dimensions of the DNA molecule.

📖 Additional Information

  • Protein sequencing
  • X-ray diffraction images
  • Paper chromatography
  • Electron microscopy

Rosalind Franklin’s famous "Photo 51" obtained via X-ray crystallography revealed the helical configuration and dimensions of the DNA molecule.

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