Question 1

Which of the following is NOT a key feature of the transduction stage in cell signaling?

Accepted Answer

Hormone secretion

Question 2

A patient is diagnosed with a disease caused by the constant activation of receptor tyrosine kinases (RTKs). Which of the following is the most likely consequence at the cellular level?

Accepted Answer

Uncontrolled cell division leading to cancer

Question 3

Which enzyme is responsible for converting ATP to cAMP during signal transduction?

Accepted Answer

Adenylyl cyclase

Question 4

A ligand binds to a G-protein-coupled receptor (GPCR) on the cell membrane. What is the immediate next step in the signaling pathway?

Accepted Answer

GTP binds to the G protein

Question 5

Which of the following best explains why moving ions across a membrane can change the voltage across that membrane?

Accepted Answer

Ions are electrically charged, so their movement alters the charge distribution across the membrane.

Question 6

Which of the following is a specific example of a cellular response to a signal?

Accepted Answer

Activating a phosphorylase

Question 7

If a cell fails to undergo apoptosis when necessary, what is a likely outcome?

Accepted Answer

Cancer

Question 8

Which of the following statements about necrosis is correct?

Accepted Answer

Necrosis occurs because of injuries or damage to the cell.

Question 9

In the context of cell signaling, what role does a hormone play when it binds to its receptor?

Accepted Answer

Ligand

Question 10

Which of the following is TRUE about plasma membrane receptors?

Accepted Answer

They are all proteins and mainly attract water-soluble signal molecules.

Question 11

During the G-protein signaling pathway, after GTP binds to the G protein, which protein is directly activated by the released subunits?

Accepted Answer

Adenylyl cyclase

Question 12

What is the primary function of protein kinase A in the cAMP signaling pathway?

Accepted Answer

To phosphorylate other proteins

Question 13

A researcher observes a cell releasing a signal molecule that binds to receptors on neighboring cells, but not to itself. What type of signaling is this?

Accepted Answer

Paracrine signaling

Question 14

Which analogy best describes the function of a ligand in an ion channel receptor?

Accepted Answer

Key

Question 15

Arrange the following stages of cell signaling in the correct order: Transduction, Reception, Response.

Accepted Answer

Reception → Transduction → Response

Question 16

Which of the following best describes cAMP in cell signaling?

Accepted Answer

A second messenger created from ATP by adenylyl cyclase

Question 17

A mutation causes a cell to produce a nonfunctional adenylyl cyclase. Which of the following would most likely be impaired?

Accepted Answer

Production of cAMP as a second messenger

Question 18

Which of the following equations correctly represents the conversion catalyzed by adenylyl cyclase?

Accepted Answer

$$\mathrm{ATP} \rightarrow \mathrm{cAMP} + \mathrm{PP_i}$$

Question 19

A cell is exposed to a water-soluble hormone. Which type of receptor is it most likely to interact with?

Accepted Answer

A protein receptor in the plasma membrane

Question 20

Which of the following best explains why apoptosis is important for multicellular organisms?

Accepted Answer

It removes damaged or unnecessary cells, preventing diseases such as cancer.

Cell Signaling and Communication: Step-by-Step Study Guidance

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