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

Intro to Nucleic Acids

Organic Chemistry

34. Nucleic Acids

Intro to Nucleic Acids

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Multiple Choice

Meselson and Stahl's experiments proved that DNA replicates by which mode?

Non-conservative replication

Dispersive replication

Conservative replication

Semi-conservative replication

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Understand the concept of DNA replication: DNA replication is the process by which a DNA molecule makes a copy of itself. It is crucial for cell division and the inheritance of genetic material.

Learn about the different modes of DNA replication: There are three main models proposed for DNA replication: conservative, semi-conservative, and dispersive.

Conservative replication: In this model, the original DNA molecule remains intact, and a completely new copy is made. This means one DNA molecule is entirely old and the other is entirely new.

Dispersive replication: This model suggests that the original DNA molecule is broken into pieces, and each piece is copied. The resulting DNA molecules are a mix of old and new DNA segments.

Semi-conservative replication: In this model, each of the two strands of the original DNA molecule serves as a template for a new strand. The result is two DNA molecules, each with one old strand and one new strand. Meselson and Stahl's experiments demonstrated this mode of replication by using isotopic labeling to show that each daughter DNA molecule contains one strand from the parent and one newly synthesized strand.