Photo 51 refers to an image of

  1. A. a crater on the Moon
  2. B. DNA molecules
  3. C. the virus responsible for COVID-19
  4. D. the virus responsible for common cold

Correct Answer: B. DNA molecules

Explanation

Photo 51 is an X-ray diffraction image of crystallized DNA taken by Rosalind Franklin in 1952, which was critical for identifying its double-helix structure.

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