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

1. Introduction to Biochemistry

Characteristics of Life

Biochemistry

1. Introduction to Biochemistry

Characteristics of Life

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Multiple Choice

Eicosanoids are not considered true hormones because __________.

they act locally rather than being transported in the bloodstream to distant targets

they are composed of amino acids rather than lipids

they are synthesized only in endocrine glands

they are stored in vesicles before release

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Verified step by step guidance

Understand the definition of eicosanoids: Eicosanoids are signaling molecules derived from arachidonic acid or other polyunsaturated fatty acids. They play a role in various physiological processes such as inflammation and immunity.

Recall the distinction between hormones and eicosanoids: Hormones are typically transported through the bloodstream to act on distant target cells, whereas eicosanoids act locally near their site of synthesis.

Evaluate the options provided: The correct answer should align with the characteristic that eicosanoids act locally rather than being transported to distant targets.

Eliminate incorrect options: For example, eicosanoids are lipid-derived molecules, not composed of amino acids, and they are synthesized in various tissues, not exclusively in endocrine glands. Additionally, they are not stored in vesicles but are synthesized on demand.

Conclude that the correct answer is: 'They act locally rather than being transported in the bloodstream to distant targets,' as this is the defining feature that differentiates eicosanoids from true hormones.