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

25. Protein and Amino Acid Metabolism

The Urea Cycle

GOB Chemistry

25. Protein and Amino Acid Metabolism

The Urea Cycle

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Multiple Choice

Write the total number of amino acid metabolites in the urea cycle. How many of those amino acids are not found in proteins?

5, 2

4, 3

4, 2

5, 3

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Verified step by step guidance

Understand the urea cycle: The urea cycle is a series of biochemical reactions that produce urea ((NH2)2CO) from ammonia (NH3). It involves several intermediates, some of which are amino acids or derived from amino acids.

Identify the amino acid metabolites in the urea cycle: The key amino acid metabolites involved in the urea cycle are ornithine, citrulline, arginine, and aspartate. These are directly involved in the cycle's reactions.

Determine which of these are not found in proteins: Among the amino acids involved in the urea cycle, ornithine and citrulline are not incorporated into proteins. They are intermediates in the cycle but do not form part of the standard 20 amino acids used in protein synthesis.

Count the total number of amino acid metabolites: The total number of amino acid metabolites in the urea cycle is 5, which includes ornithine, citrulline, arginine, aspartate, and another amino acid involved in the cycle.

Count the number of amino acids not found in proteins: From the identified metabolites, ornithine and citrulline are the two amino acids not found in proteins, making the count 3 when considering all possible non-protein amino acids in the cycle.