Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

26. Nucleic Acids and Protein Synthesis

Nitrogenous Bases

GOB Chemistry

26. Nucleic Acids and Protein Synthesis

Nitrogenous Bases

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Multiple Choice

Draw a structure for cytosine.

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Identify the molecular structure of cytosine, which is a pyrimidine derivative with the chemical formula C4H5N3O.

Recognize that cytosine is one of the four main bases found in DNA and RNA, and it pairs with guanine in DNA through three hydrogen bonds.

Understand that the structure of cytosine consists of a single six-membered ring containing two nitrogen atoms at positions 1 and 3, an amino group (NH2) at position 4, and a keto group (C=O) at position 2.

Visualize the pyrimidine ring, which is a heterocyclic aromatic ring with alternating double and single bonds, contributing to its stability and planarity.

Draw the structure by placing the amino group at the top of the ring, the keto group at the bottom right, and ensure the nitrogen atoms are positioned correctly within the ring to complete the cytosine structure.