Question 1

Which of the following best describes the primary function of cell communication in multicellular organisms?

Accepted Answer

To coordinate and regulate cellular activities in response to external and internal signals

Question 2

Quorum sensing in prokaryotes is an example of which type of cell signaling?

Accepted Answer

Local signaling

Question 3

During the 'fight or flight' response, which hormone is released into the bloodstream to trigger cellular responses in muscle cells?

Accepted Answer

Epinephrine

Question 4

Which of the following is NOT a characteristic advantage of having multiple relay molecules in a signal transduction pathway?

Accepted Answer

Ensuring the signal is only received by one cell

Question 5

Which type of cell signaling involves messenger molecules traveling short distances to affect nearby target cells?

Accepted Answer

Paracrine signaling

Question 6

A neurotransmitter released from a neuron diffuses across a synapse and binds to receptors on a target cell. This is an example of:

Accepted Answer

Synaptic signaling

Question 7

Which of the following is a correct sequence for the three stages of cell signaling?

Accepted Answer

Reception → Transduction → Response

Question 8

Which type of membrane receptor is most directly involved in the sense of smell and taste?

Accepted Answer

G protein-coupled receptors (GPCRs)

Question 9

What is the main function of receptor tyrosine kinases (RTKs) in cell signaling?

Accepted Answer

To transfer phosphate groups from ATP to specific tyrosines on themselves

Question 10

Which of the following best explains why steroid hormones can bind to intracellular receptors?

Accepted Answer

Steroid hormones are hydrophobic and can readily cross the plasma membrane

Question 11

A mutation prevents a G protein from binding GTP. What is the most likely consequence for the cell?

Accepted Answer

The G protein will remain inactive and fail to transmit the signal

Question 12

Which of the following is TRUE about ligand-gated ion channel receptors?

Accepted Answer

They open or close in response to binding of a specific ligand, allowing ions to pass through the membrane

Question 13

Which equation best represents the phosphorylation reaction catalyzed by receptor tyrosine kinases (RTKs)?

Accepted Answer

$$ATP + 	ext{protein} \rightarrow ADP + 	ext{phosphorylated protein}$$

Question 14

Which of the following scenarios best illustrates autocrine signaling?

Accepted Answer

A cell releases growth factors that bind to its own receptors, stimulating its own division

Question 15

Which of the following is a direct result of the formation of a hormone-receptor complex inside the cell?

Accepted Answer

Activation of transcription of specific genes

Question 16

A patient is given a drug that blocks the function of GPCRs. Which physiological process would most likely be affected?

Accepted Answer

Detection of odors in the nose

Question 17

Which of the following is a key difference between endocrine and paracrine signaling?

Accepted Answer

Endocrine signaling involves hormones traveling long distances through the bloodstream, while paracrine signaling involves local regulators acting on nearby cells

Question 18

Which of the following best explains why signal transduction pathways often involve multiple steps?

Accepted Answer

To amplify the signal and provide multiple points for regulation

Question 19

Which of the following is most likely to occur if a ligand-gated ion channel receptor fails to close after ligand dissociation?

Accepted Answer

Continuous influx of ions, potentially disrupting cellular homeostasis

Question 20

A researcher discovers a new hormone that is hydrophobic and affects gene expression in animal cells. Which type of receptor is this hormone most likely to bind?

Accepted Answer

Intracellular receptor

Cell Communication: Mechanisms and Types of Signaling in Biology

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드