Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

34. Nucleic Acids

DNA Double Helix

Organic Chemistry

34. Nucleic Acids

DNA Double Helix

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Multiple Choice

Rosalind Franklin's X-ray diffraction image of DNA revealed what shape of the DNA structure?

Circular loop

Double helix

Single strand

Triple helix

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Verified step by step guidance

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.