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

12. Biosignaling

Lipid Hormone Signaling

Biochemistry

12. Biosignaling

Lipid Hormone Signaling

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Multiple Choice

Upon secretion, a chemical messenger (hormone) binds its receptors on other cells that were nearby. The hormone was secreted in such low concentration that it did not have any effect on distant cells, even though those distant cells had the appropriate receptors. We would best classify this hormone as a(n):

Endocrine hormone.

Paracrine hormone.

Autocrine hormone.

Both an autocrine hormone and an endocrine hormone.

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Verified step by step guidance

Understand the definitions of different types of hormones: Endocrine hormones are secreted into the bloodstream and can affect distant cells. Paracrine hormones affect nearby cells. Autocrine hormones affect the cell that secreted them.

Identify the key characteristic of the hormone in the problem: It affects nearby cells but not distant ones, even though distant cells have the appropriate receptors.

Relate the hormone's behavior to the definitions: Since the hormone affects nearby cells, it fits the definition of a paracrine hormone.

Consider why it is not an endocrine hormone: Endocrine hormones would affect distant cells, which is not the case here.

Evaluate the possibility of it being an autocrine hormone: The problem does not mention the hormone affecting the cell that secreted it, so it is not classified as autocrine.