Chapter 5, Section 5.6 — LO 1 — Functions of Ligands, Receptors, and Signal Transduction

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5 Terms

1
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What is a ligand?

A molecule that binds a receptor and can deliver a signal.

2
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What does a receptor do?

Recognizes a ligand and initiates or modifies the target cell response.

3
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Why do cells respond only to certain ligands?

They generally need an appropriate receptor and signaling machinery.

4
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What are the three stages of cell signaling?

Reception → signal transduction → cellular response.

5
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What are two major cellular responses to signaling?

Changing existing protein activity or changing gene expression.