Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

3. Amino Acids

Essential Amino Acids

Biochemistry

3. Amino Acids

Essential Amino Acids

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Multiple Choice

Approximately how many different amino acids are used in the synthesis of body proteins in humans?

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Verified step by step guidance

Understand the context: Proteins are synthesized in the human body using amino acids, which are organic molecules that serve as the building blocks of proteins. The question asks about the number of amino acids involved in this process.

Recall the key concept: In humans, there are 20 standard amino acids that are directly encoded by the genetic code and used in protein synthesis. These are often referred to as the 'canonical' amino acids.

Clarify the distinction: While there are 20 standard amino acids, additional amino acids like selenocysteine and pyrrolysine (making a total of 22) are used in specific proteins but are not universally involved in protein synthesis. This is why the correct answer focuses on the 20 standard amino acids.

Eliminate incorrect options: The options '12' and '9' are incorrect because they do not represent the number of amino acids used in protein synthesis. Humans require 20 amino acids for this process.

Conclude the reasoning: The correct answer is 20 because these are the amino acids universally used in the synthesis of body proteins in humans, as encoded by the genetic code.