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

1. A Review of General Chemistry

Intro to Organic Chemistry

Organic Chemistry

1. A Review of General Chemistry

Intro to Organic Chemistry

Previous problemNext problem

Struggling with Organic Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

In the context of DNA replication, why are the two new strands referred to as semi-conservative?

Both new DNA molecules are entirely composed of newly synthesized strands.

The new DNA molecules are synthesized in a conservative manner, preserving the original strands completely.

Each new DNA molecule consists of one original strand and one newly synthesized strand.

Each new DNA molecule is composed of two original strands.

Previous problemNext problem

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: In the semi-conservative model of DNA replication, each of the two new DNA molecules consists of one original (parental) strand and one newly synthesized strand.

Compare with other models: The conservative model suggests that the original DNA molecule remains intact and a completely new molecule is synthesized. The dispersive model suggests that the original DNA is fragmented and interspersed with new DNA.

Recognize the experimental evidence: The semi-conservative model was confirmed by the Meselson-Stahl experiment, which demonstrated that after replication, each DNA molecule consists of one old and one new strand.

Conclude why it's called semi-conservative: The term 'semi-conservative' reflects the fact that each new DNA molecule conserves one of the original strands, ensuring genetic continuity across generations.