Question: Which of these is a receptor molecule?

Answer: B

Question: A signal transduction pathway is initiated when a _____ binds to a receptor.

Answer: Signal Molecule

Question: Which of these is a signal molecule?

Answer: A

Question: A signal molecule is also known as a(n) _____.

Answer: ligand

Question: Which of these is the second of the three stages of cell signaling?

Answer: Transduction

Question: Cortisol is a steroid hormone that can pass through the plasma membrane. Complete the flowchart describing the interaction of cortisol with intracellular receptors.

Answer:

Question: G protein-coupled receptors

Answer: interact directly with G proteins

Question: Receptor tyrosine kinases

Answer: -catalyzes the transfer of a phosphate group to the receptor

-binding of the signaling molecules forms a dimer

Question: Both types of receptors

Answer: -binding site for signaling molecule is located on the extracellular side of the cell

-receptor is located in the plasma membrane

Question: Neither receptor

Answer: binding of the signaling molecule allows ions to flow through a channel in the receptor