AP Biology/Unit 4/Note Packet
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Unit 4: Cell Communication and Cell Cycle

AP Biology — Note Packet

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Key Terms

Signal Transduction Pathway

A series of steps converting an external signal into an internal cellular _.

Ligand

A _ molecule that binds to a receptor.

Receptor

A specific molecule (on or in the cell) that _ a ligand.

Quorum Sensing

A mechanism used by bacteria to detect population _ and coordinate activities.

Reception

The stage where a ligand binds to a specific _.

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