Cell Signaling Quiz

True or False: A cell receives one type of signal at a time.

• True

• False

Answer explanation

False is correct because a cell can receive multiple types of signals simultaneously, allowing it to integrate various information and respond appropriately to different stimuli.

What is the role of a receptor in cell signaling?

• To destroy harmful proteins

• To recognize the shape of the signaling ligand

• To produce energy for the cell

• To transport nutrients

Answer explanation

Receptors play a crucial role in cell signaling by recognizing the shape of signaling ligands, which allows cells to respond appropriately to various signals. This specificity is essential for effective communication between cells.

What is the property of epithelial cells that allows them to proliferate once they have detached from the basement membrane?

• Contact inhibition.

• Adherence-independent growth.

• Cadherins.

• Stromal cell specialization.

Answer explanation

Epithelial cells exhibit adherence-independent growth, allowing them to proliferate even after detaching from the basement membrane. This property enables them to continue dividing without the need for attachment.

What happens when epithelial cells detach from the basement membrane?

• They stop proliferating.

• They undergo adherence-independent growth.

• They become stromal cells.

• They lose all signaling capabilities.

Answer explanation

When epithelial cells detach from the basement membrane, they can undergo adherence-independent growth, allowing them to proliferate without the usual anchorage, which is crucial in processes like tumorigenesis.

What is a key trait that tumor cells acquire early in their development?

• Ability to respond to paracrine signals

• Ability to respond to endocrine signals

• Loss of ability to respond to paracrine and endocrine signals

• Increased sensitivity to paracrine signals

Answer explanation

Tumor cells often acquire a loss of ability to respond to paracrine and endocrine signals early in their development, allowing them to grow independently of normal regulatory mechanisms.

What type of signals do cancer cells release that are similar to those used during wound healing?

• Paracrine signals

• Endocrine signals

• Autocrine signals

• Neural signals

Answer explanation

Cancer cells often release autocrine signals, which are similar to those used in wound healing. These signals act on the same cells that produce them, promoting growth and survival, similar to the healing process.

What is the role of endocrine signals in normal tissue?

• Promote tissue destruction

• Prevent proliferation

• Enhance migration

• Stimulate growth

Answer explanation

Endocrine signals play a crucial role in maintaining tissue homeostasis by preventing excessive cell proliferation, thus ensuring normal tissue function and preventing disorders such as cancer.

Which type of signaling involves communication between neighboring cells?

• Endocrine signaling

• Paracrine signaling

• Autocrine signaling

• Signaling cascade

Answer explanation

Paracrine signaling involves the release of signaling molecules that affect nearby cells, facilitating communication between neighboring cells. In contrast, endocrine signaling targets distant cells, and autocrine signaling affects the same cell that releases the signal.

What are proteins that are responsible for altering the expression of genes?

• Ligands

• Receptors

• Transcription factors

• Cadherins

Answer explanation

Transcription factors are proteins that bind to specific DNA sequences, regulating the transcription of genes. They play a crucial role in altering gene expression, unlike ligands, receptors, or cadherins.

Please draw a line of columnar cells.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2