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

Amino Acid Groups

Biochemistry

3. Amino Acids

Amino Acid Groups

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Multiple Choice

Which of the following is an example of a modified amino acid hormone?

Thyroxine ($T_4$)

Cortisol

Insulin

Aldosterone

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Verified step by step guidance

Step 1: Understand the classification of hormones. Hormones can be categorized into three main types: peptide hormones, steroid hormones, and amino acid-derived hormones. Modified amino acid hormones are derived from single amino acids that undergo chemical modifications.

Step 2: Identify the chemical nature of each option provided. Thyroxine ($T_4$) is derived from the amino acid tyrosine and is chemically modified by the addition of iodine atoms, making it an example of a modified amino acid hormone.

Step 3: Analyze the other options. Cortisol and aldosterone are steroid hormones derived from cholesterol, not amino acids. Insulin is a peptide hormone composed of chains of amino acids, not a single modified amino acid.

Step 4: Compare the options to the definition of a modified amino acid hormone. Thyroxine ($T_4$) fits the criteria because it is derived from tyrosine and chemically altered, while the other options do not meet this definition.

Step 5: Conclude that Thyroxine ($T_4$) is the correct answer as it is an example of a modified amino acid hormone, based on its derivation and chemical structure.