Question 1

Which of the following best describes the primary structural component of the extracellular matrix (ECM) in animal cells?

Accepted Answer

Collagen fibrils

Question 2

What is the main function of proteoglycans in the ground substance of the ECM?

Accepted Answer

To give the ECM a rubber-like consistency

Question 3

Which structure is responsible for gluing adjacent plant cells together?

Accepted Answer

Middle lamella

Question 4

Tight junctions are most likely to be found in which type of tissue?

Accepted Answer

Epithelial tissue

Question 5

Which of the following best explains why desmosomes are important in muscle cells?

Accepted Answer

They provide strong adhesion by linking cytoskeletons

Question 6

Gap junctions in animal cells are functionally similar to which structure in plant cells?

Accepted Answer

Plasmodesmata

Question 7

A researcher observes that ions and small molecules can move directly between adjacent animal cells. Which structure is most likely responsible for this observation?

Accepted Answer

Gap junctions

Question 8

Which of the following best describes the symplast in plant tissues?

Accepted Answer

The shared cytoplasm connected by plasmodesmata

Question 9

Which of the following is a key difference between hormone signaling and neurotransmitter signaling in multicellular organisms?

Accepted Answer

Hormones are secreted into the bloodstream and act on distant target cells, while neurotransmitters act locally

Question 10

Which of the following best describes the role of G-protein-coupled receptors in signal transduction?

Accepted Answer

They initiate the production of intracellular second messengers

Question 11

A mutation prevents the phosphorylation of proteins inside a target cell after a signal is received. Which type of receptor is most likely affected?

Accepted Answer

Enzyme-linked receptor

Question 12

Which of the following scenarios best illustrates the concept of signal amplification in cell signaling?

Accepted Answer

A single hormone molecule triggers the activation of many intracellular enzymes

Question 13

Which of the following is true about crosstalk in signaling pathways?

Accepted Answer

It allows different signaling pathways to interact and influence each other

Question 14

Which of the following best explains why the ECM is important for tissue integrity in animals?

Accepted Answer

It provides structural support and resists tension and compression

Question 15

A patient has a genetic disorder that affects the production of collagen. Which tissue property is most likely to be compromised?

Accepted Answer

Ability to resist tension

Question 16

Which of the following best describes the function of the middle lamella in plant cells?

Accepted Answer

It glues adjacent plant cells together using pectins

Question 17

Which of the following is a direct result of gap junctions in cardiac muscle tissue?

Accepted Answer

Coordinated contraction due to rapid ion flow

Question 18

Which of the following best describes the apoplast in plant tissues?

Accepted Answer

The extracellular space outside the plasma membrane

Question 19

Which of the following is a real-world example of enzyme-linked receptor signaling?

Accepted Answer

Insulin binding to its receptor and triggering a phosphorylation cascade

Question 20

A scientist observes that a signaling molecule binds to a receptor inside the cytosol rather than on the cell surface. What property must this signaling molecule have?

Accepted Answer

It must be able to cross the plasma membrane (hydrophobic or small)

Cell–Cell Interactions: Structure, Adhesion, and Communication

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