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

Base Pairing

Organic Chemistry

34. Nucleic Acids

Base Pairing

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Multiple Choice

How are the base pairing rules related to Chargaff's research on DNA?

Chargaff's research demonstrated that DNA is a triple helix, which contradicts the base pairing rules.

Chargaff's research indicated that the amount of adenine equals guanine and the amount of thymine equals cytosine, which supports the base pairing rules.

Chargaff's research proved that DNA is composed of equal amounts of all four bases, which supports the base pairing rules.

Chargaff's research showed that the amount of adenine equals thymine and the amount of guanine equals cytosine, which supports the base pairing rules.

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Verified step by step guidance

Understand the context of Chargaff's research: Chargaff's rules are based on the observation of the ratios of nucleotide bases in DNA.

Identify the key components of DNA: DNA is composed of four nucleotide bases - adenine (A), thymine (T), guanine (G), and cytosine (C).

Recall Chargaff's findings: Chargaff discovered that in any given DNA sample, the amount of adenine is approximately equal to the amount of thymine, and the amount of guanine is approximately equal to the amount of cytosine.

Relate Chargaff's findings to base pairing rules: The base pairing rules state that adenine pairs with thymine and guanine pairs with cytosine, which aligns with Chargaff's observation of equal amounts of these pairs.

Conclude the relationship: Chargaff's research supports the base pairing rules by demonstrating that the quantities of adenine and thymine, as well as guanine and cytosine, are equal, which is consistent with the complementary base pairing in the DNA double helix structure.