Question 1

Which of the following best describes the three stages of cell signaling?

Accepted Answer

Reception, transduction, and response

Question 2

A cell is considered a 'target' for a hormone if:

Accepted Answer

It has receptors specific to that hormone

Question 3

Which type of receptor is most likely to bind a water-soluble ligand?

Accepted Answer

Membrane-bound receptor

Question 4

What is the primary function of protein kinases in signal transduction pathways?

Accepted Answer

To add phosphate groups to proteins using ATP

Question 5

Which of the following is a common second messenger in cell signaling pathways?

Accepted Answer

Cyclic AMP ($$cAMP)$$

Question 6

How do enzyme cascades in signal transduction amplify a cellular response?

Accepted Answer

By sequentially activating multiple proteins, each step multiplying the signal

Question 7

Which of the following is TRUE about G-protein-coupled receptors (GPCRs)?

Accepted Answer

They activate G proteins by exchanging GDP for GTP

Question 8

A mutation prevents a cell from producing protein phosphatases. What is the most likely effect on signal transduction?

Accepted Answer

Phosphorylation cascades will remain active longer than normal

Question 9

Steroid hormones like testosterone typically exert their effects by:

Accepted Answer

Diffusing through the membrane and binding to intracellular receptors to regulate gene expression

Question 10

Which of the following best explains why only certain cells respond to a particular hormone?

Accepted Answer

Only those cells have the specific receptor for the hormone

Question 11

What is the role of cyclic AMP ($$cAMP) in a $$signal transduction pathway?

Accepted Answer

It acts as a second messenger to amplify the signal

Question 12

Which of the following is a cytoplasmic response to cell signaling?

Accepted Answer

Activation of enzymes

Question 13

A cell receives a signal that triggers apoptosis. What is the most likely outcome?

Accepted Answer

The cell will self-destruct in a controlled manner

Question 14

Which of the following is a major category of membrane-bound receptor?

Accepted Answer

G-protein-coupled receptor

Question 15

What is the effect of cholera toxin on G protein signaling?

Accepted Answer

It disrupts G protein function, leading to abnormal cellular responses

Question 16

Which process is responsible for removing phosphate groups from proteins in a signaling pathway?

Accepted Answer

Protein phosphatases

Question 17

In a phosphorylation cascade, what is the general formula for the amplification of signal molecules if each kinase activates 10 downstream molecules per step over 4 steps?

Accepted Answer

$$10^4$$

Question 18

Which of the following is NOT a function of second messengers?

Accepted Answer

Directly binding to DNA to regulate gene expression

Question 19

What is the main reason that disruptions in receptor tyrosine kinase pathways are often associated with cancer?

Accepted Answer

They can lead to uncontrolled cell division due to improper signaling

Question 20

Which of the following best describes paracrine signaling?

Accepted Answer

A cell secretes a local regulator that affects nearby cells

Chapter 11: Cell Communication – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards