CDS 2024 · PYQ · Biology / History of Science · medium
Photo 51 refers to an image of
A.a crater on the Moon
B.DNA molecules✓ Correct
C.the virus responsible for COVID-19
D.the virus responsible for common cold
Explanation
Photo 51 is the famous X-ray diffraction image of a DNA fibre taken in May 1952 by Raymond Gosling, working under Rosalind Franklin at King's College London. The image's clear X-pattern was crucial evidence for the double-helix structure of DNA, later proposed by Watson and Crick in 1953.
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