Multiple Choice
Why is it important that Taq DNA polymerase is heat-stable in the context of PCR (Polymerase Chain Reaction)?
34. Nucleic Acids
DNA Double Helix
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Rosalind Franklin's X-ray diffraction image of DNA revealed what shape of the DNA structure?
A
Circular loop
B
Double helix
C
Single strand
D
Triple helix
Verified step by step guidance1
Understand the context: Rosalind Franklin's X-ray diffraction image was crucial in revealing the structure of DNA. Her work provided key insights into the molecular arrangement of DNA.
Recognize the significance of X-ray diffraction: This technique allows scientists to determine the three-dimensional structure of molecules by analyzing the pattern of X-rays scattered by the atoms in the molecule.
Identify the options given: The problem provides several possible shapes for the DNA structure: Circular loop, Double helix, Single strand, and Triple helix.
Recall the historical and scientific context: The discovery of the double helix structure of DNA was a pivotal moment in molecular biology, largely attributed to the work of Watson, Crick, and Franklin.
Conclude based on scientific evidence: The X-ray diffraction image taken by Rosalind Franklin showed a pattern consistent with a double helix structure, which is the correct answer.
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