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

Which of the following amino acids can be synthesized by the human body (i.e., is a non-essential amino acid)?

Threonine

Lysine

Alanine

Leucine

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Verified step by step guidance

Step 1: Understand the concept of essential and non-essential amino acids. Essential amino acids cannot be synthesized by the human body and must be obtained through the diet, while non-essential amino acids can be synthesized by the body.

Step 2: Review the list of essential amino acids. Essential amino acids include Threonine, Lysine, Leucine, and others. These are required from dietary sources.

Step 3: Identify Alanine as a non-essential amino acid. Alanine is synthesized in the human body, primarily through the transamination of pyruvate, making it non-essential.

Step 4: Compare the amino acids listed in the problem (Threonine, Lysine, Alanine, Leucine) to determine which are essential and which are non-essential. Alanine is the only non-essential amino acid in the list.

Step 5: Conclude that Alanine is the correct answer because it is synthesized by the human body, unlike Threonine, Lysine, and Leucine, which are essential amino acids.