Multiple Choice
One turn of a DNA sequence is comprised of 15% adenine (A). If the bonding energies of A–T and G–C are 24 kJ/mol and 18 kJ/mol respectively, calculate the approximate total bonding energy in this one turn.
34. Nucleic Acids
DNA Double Helix
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Which scientist confirmed the helical nature of DNA using X-ray diffraction?
A
Francis Crick
B
Linus Pauling
C
James Watson
D
Rosalind Franklin
Verified step by step guidance1
Understand the context: The question is about the discovery of the helical structure of DNA, which is a significant milestone in molecular biology.
Identify the key technique: X-ray diffraction is a method used to determine the atomic and molecular structure of a crystal by scattering X-rays on the crystal and analyzing the pattern.
Recognize the contributions: Rosalind Franklin was a scientist who used X-ray diffraction to capture images of DNA, which provided critical evidence for its helical structure.
Differentiate the roles: While Francis Crick and James Watson are known for proposing the double helix model of DNA, it was Rosalind Franklin's X-ray diffraction images that confirmed the helical nature.
Conclude with the correct attribution: Based on the evidence from X-ray diffraction, Rosalind Franklin's work was pivotal in confirming the helical structure of DNA.
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