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 cartilage its 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 reinforce cell–cell attachment by linking cytoskeletal intermediate filaments.

Question 6

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

Accepted Answer

Plasmodesmata

Question 7

A mutation disrupts the formation of G-protein-coupled receptors in a cell. Which process would be most directly affected?

Accepted Answer

Amplification and diversification of extracellular signals

Question 8

Which of the following is a direct result of enzyme-linked receptor activation?

Accepted Answer

Phosphorylation of proteins inside the target cell

Question 9

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

Accepted Answer

The shared cytoplasm connected by plasmodesmata

Question 10

A researcher observes that a signaling molecule binds to a receptor inside the cytosol of a target cell. What can be inferred about this signaling molecule?

Accepted Answer

It is likely hydrophobic and can diffuse through the plasma membrane.

Question 11

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 12

Which of the following is NOT a function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

Synthesizing ATP for cellular energy

Question 13

If a toxin disrupts the formation of tight junctions in the intestinal epithelium, what is the most likely consequence?

Accepted Answer

Loss of selective permeability, leading to leakage between cells

Question 14

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

Accepted Answer

It glues adjacent plant cells together using pectins.

Question 15

Which of the following is a key difference between gap junctions and desmosomes?

Accepted Answer

Gap junctions allow passage of small molecules, while desmosomes provide strong mechanical attachment.

Question 16

A patient has a genetic disorder affecting the production of cytosolic anchoring proteins. Which cellular structure is most likely to be compromised?

Accepted Answer

Desmosomes

Question 17

Which of the following best explains why hormones can act on target cells far from their site of secretion?

Accepted Answer

Hormones circulate throughout the body via the bloodstream.

Question 18

Which of the following best describes crosstalk in cell signaling pathways?

Accepted Answer

The interaction between different signaling pathways within a cell

Question 19

A scientist observes that a certain signaling pathway involves the phosphorylation of a series of proteins. Which type of receptor is most likely involved?

Accepted Answer

Enzyme-linked receptor

Question 20

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

Accepted Answer

It provides a scaffold that resists tension and compression.

Cell–Cell Interactions: Structure, Adhesion, and Communication in Animal and Plant Cells

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