Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 General Science Biology Cell

Who among the following proposed the twisted ladder model of DNA structure in 1953? 

1
James Watson and Francis Crick 
2
Rosalind Franklin and Maurice Wilkins 
3
Friedrich Miescher and Erwin Chargaff 
4
Linus Pauling and Oswald Avery 
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