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

Why is the DNA molecule considered semi-conservative?

Each new DNA molecule consists of one old strand and one new strand.

Each new DNA molecule is composed entirely of new strands.

Each new DNA molecule is composed entirely of old strands.

Each new DNA molecule contains two new strands and two old strands.

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Verified step by step guidance

Understand the concept of DNA replication: DNA replication is the process by which a DNA molecule makes a copy of itself. This process is crucial for cell division and the transmission of genetic information.

Learn about the semi-conservative model: The semi-conservative model of DNA replication suggests that each of the two strands of the DNA double helix serves as a template for the formation of a new complementary strand.

Analyze the semi-conservative replication process: During replication, the two strands of the original DNA molecule separate. Each original strand then serves as a template for a new strand, resulting in two DNA molecules, each with one old (parental) strand and one new (daughter) strand.

Compare with other models: The conservative model would result in one completely old DNA molecule and one completely new DNA molecule, while the dispersive model would involve segments of old and new DNA interspersed in each strand. The semi-conservative model is distinct because it maintains one old strand in each new DNA molecule.

Conclude why DNA is considered semi-conservative: Based on the semi-conservative model, each new DNA molecule consists of one old strand and one new strand, which is why DNA replication is described as semi-conservative.