Cell-to-Cell Communication Practice Questions

Question 1

What is the role of gap junctions in cardiac muscle function?

Accepted Answer

Facilitate impulse transmission between cardiac myocytes

Answer

Are not found in cardiac muscles

Answer

Are not found in smooth muscles

Answer

Have no significant role in cardiac muscle function

Question 2

Some cells secrete chemicals into the extracellular fluid that act on cells in the same tissue. Which of the following refers to this type of regulation?

Accepted Answer

Paracrine

Answer

Neural

Answer

Endocrine

Answer

Neuroendocrine

Question 3

Which of the following act through tyrosine kinase receptor:

Accepted Answer

Insulin

Answer

GH

Answer

FSH

Answer

Glucagon

Question 4

Which of the following neurotransmitters is primarily released from the sympathetic nervous system to increase heart rate in response to a DECREASE in blood pressure?

Accepted Answer

Norepinephrine

Answer

Dopamine

Answer

Acetylcholine

Answer

Epinephrine

Question 5

Which of the following statements best describes the mechanism of action of insulin on target cells?

Accepted Answer

Insulin binds to a transmembrane receptor on the outer surface of the plasma membrane, activating the tyrosine kinase in the cytosolic domain of the receptor.

Answer

Insulin binds to a receptor on the outer surface of the plasma membrane, activating adenylate cyclase through the Gs protein.

Answer

Insulin binds to a cytoplasmic receptor and is transferred as a hormone receptor complex to the nucleus to modulate gene expression.

Answer

Insulin enters the cell and causes the release of calcium ions from intracellular stores.

Question 6

Which of the following binds to intracellular receptors?

Accepted Answer

Estrogen

Answer

Growth hormone

Answer

Vitamin E

Answer

Insulin

Question 7

Cell-to-cell permeability occurs through

Accepted Answer

Connexins

Answer

Occludin

Answer

Zona adherens

Answer

Zonulin

Question 8

Which of the following statements accurately describes G proteins?

Accepted Answer

Are associated with cellular membranes and play a crucial role in signal transduction.

Answer

Regulate second messengers like cyclic adenosine monophosphate (cAMP).

Answer

Play a role in the amplification of hormonal signals.

Answer

Consist of three subunits: alpha, beta, and gamma.

Question 9

Prokaryotes do not have

Accepted Answer

Mitochondria

Answer

Ribosome

Answer

Cell wall

Answer

Cell membrane

Question 10

Which of the following is a major component of the plasma membrane?

Accepted Answer

Phospholipid

Answer

Protein

Answer

Carbohydrate

Answer

Cholesterol

Cell-to-Cell Communication — MCQs

Cell-to-Cell Communication — MCQs

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