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Question

Which of the following provided the major clue that led to the recognition of the double helical structure of DNA?

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Choose one · Correct answer highlighted

Explanation

Rosalind Franklin's X-ray diffraction Photo 51 revealed helical diffraction pattern with characteristic cross and 3.4 Å base spacing. Watson and Crick interpreted this image plus Chargaff data to build antiparallel double helix model explaining complementarity and replication.

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