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Cell Signaling and Communication Quiz

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Questions and Answers

What is the function of the tyrosine kinase domain in receptor proteins?

Act as an ion channel for signaling

Bind to the extracellular ligands

Facilitate autophosphorylation of the intracellular domain (correct)

Catalyze the hydrolysis of GDP to GTP

What is the main purpose of G alpha and G beta-gamma proteins upon ligand binding to receptors?

Hydrolyze cAMP

Inhibit the activity of target proteins

Promote receptor internalization

Separate and initiate downstream signaling pathways (correct)

Which enzyme is responsible for converting glycogen into glucose-1-phosphate?

Protein kinase A

Adenylate cyclase (correct)

G protein-coupled receptor

Arrestin

What is a common characteristic of cancer cells in terms of signaling pathways?

Cells find redundant pathways when one pathway is blocked Signup and view all the answers

In the context of cell signaling, what role does negative feedback play?

Creates a delay in further signaling Signup and view all the answers

How do cells overcome the challenge posed by blocking a single pathway in cancer therapies?

By finding redundant pathways to achieve similar outcomes Signup and view all the answers

What is the main task of cell signaling?

To coordinate cellular processes Signup and view all the answers

What can happen if the coordination of cell signaling goes wrong?

It can lead to disease Signup and view all the answers

What is the role of feedback in cell signaling?

To demonstrate to the sender that the message was received properly Signup and view all the answers

What is the role of a ligand in cell signaling?

To be released by the sending cell and sensed by the target cell via a receptor Signup and view all the answers

What is an example of paracrine signaling?

A cell targeting a nearby cell Signup and view all the answers

How do small molecules like steroids facilitate cell signaling?

By being taken up without receptors and then binding to intracellular receptors Signup and view all the answers