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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

1. A Review of General Chemistry

Intro to Organic Chemistry

Organic Chemistry

1. A Review of General Chemistry

Intro to Organic Chemistry

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Multiple Choice

Which two scientists produced the X-ray diffraction patterns that Watson and Crick used to determine the structure of DNA?

Rosalind Franklin and Maurice Wilkins

Erwin Chargaff and Max Perutz

James Watson and Francis Crick

Linus Pauling and Robert Corey

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Begin by understanding the historical context of DNA structure discovery. The structure of DNA was elucidated in the early 1950s, a pivotal moment in molecular biology.

Recognize the key technique used: X-ray diffraction. This method involves directing X-rays at a crystalline sample and analyzing the pattern of scattered rays to infer the structure of the molecule.

Identify the scientists associated with X-ray diffraction studies of DNA. Rosalind Franklin and Maurice Wilkins were instrumental in producing high-quality X-ray diffraction images of DNA.

Understand the role of these images in the discovery process. Watson and Crick used the diffraction patterns obtained by Franklin and Wilkins to build their model of the DNA double helix.

Review the contributions of other scientists mentioned. Erwin Chargaff discovered base pairing rules, while Linus Pauling and Robert Corey worked on protein structures, not directly on DNA.