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

Nitrogenous Bases

Organic Chemistry

34. Nucleic Acids

Nitrogenous Bases

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Multiple Choice

What is the significance of the pairing of nitrogenous bases in DNA?

It facilitates the conversion of DNA into RNA during transcription.

It prevents the formation of hydrogen bonds between the DNA strands.

It ensures that DNA strands are identical to each other.

It allows for the double helix structure to be stable and enables accurate replication.

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Verified step by step guidance

Understand the structure of DNA: DNA is composed of two strands that form a double helix. Each strand is made up of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.

Identify the nitrogenous bases: In DNA, there are four nitrogenous bases - adenine (A), thymine (T), cytosine (C), and guanine (G). These bases pair specifically: adenine pairs with thymine, and cytosine pairs with guanine.

Explore base pairing rules: The pairing of nitrogenous bases is due to hydrogen bonding. Adenine forms two hydrogen bonds with thymine, while cytosine forms three hydrogen bonds with guanine. This specific pairing is crucial for the stability of the DNA double helix.

Consider the role in DNA replication: The specific pairing of bases ensures that when DNA replicates, each strand serves as a template for the formation of a new complementary strand. This allows for accurate replication of genetic information.

Reflect on the significance of base pairing: The stability provided by base pairing is essential for the structural integrity of DNA and its ability to store and transmit genetic information accurately during cell division and reproduction.