Question 1

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

Accepted Answer

It provides structural support, helps define cell shape, and attaches cells to one another.

Question 2

A researcher is studying a tissue where cells are tightly bound together to form a waterproof barrier, such as in the lining of the intestines. Which type of cell junction is most likely responsible for this function?

Accepted Answer

Tight junctions

Question 3

Which component of the plant cell wall is primarily responsible for resisting tension and providing structural support?

Accepted Answer

Cellulose microfibrils

Question 4

In animal tissues, which protein is most abundant in the fibrous component of the extracellular matrix and is essential for providing tensile strength?

Accepted Answer

Collagen

Question 5

Which of the following statements about plasmodesmata is correct?

Accepted Answer

They are membrane-lined channels that allow cytoplasmic continuity between plant cells.

Question 6

A mutation in a plant prevents the production of expansins. Which of the following is the most likely consequence?

Accepted Answer

The plant cells will have reduced ability to grow because the cell wall cannot loosen properly.

Question 7

Which of the following best explains why desmosomes are especially important in muscle and epithelial tissues?

Accepted Answer

They provide strong cell-cell adhesion by anchoring to intermediate filaments, helping tissues resist mechanical stress.

Question 8

Which of the following is a key difference between the cell walls of bacteria and archaea?

Accepted Answer

Bacterial cell walls contain peptidoglycan, while archaeal cell walls lack peptidoglycan and instead have a dense protein S-layer.

Question 9

Which of the following best describes the role of integrins in animal cells?

Accepted Answer

They anchor the cytoskeleton to the extracellular matrix by binding to proteins such as laminins.

Question 10

A scientist observes that ions and small molecules can rapidly pass between adjacent animal cells, allowing them to coordinate their activities. Which structure is most likely responsible for this observation?

Accepted Answer

Gap junctions

Question 11

Which of the following is true regarding the middle lamella in plant tissues?

Accepted Answer

It is a gelatinous layer rich in pectins that glues adjacent plant cells together.

Question 12

Which of the following best describes the difference between the symplast and apoplast in plant tissues?

Accepted Answer

The symplast is the shared cytoplasm connected by plasmodesmata, while the apoplast is the extracellular space outside the plasma membrane.

Question 13

Which of the following scenarios best illustrates the function of gap junctions in human physiology?

Accepted Answer

Coordinated contraction of heart muscle cells due to rapid ion flow between cells.

Question 14

Which of the following statements about cadherins is correct?

Accepted Answer

Cadherins are linking proteins in desmosomes that bind only to cadherins of the same type, allowing specific cell-cell adhesion.

Question 15

A patient has a genetic disorder that affects the production of proteoglycans in cartilage. Which of the following symptoms would you most likely expect?

Accepted Answer

Stiff, brittle cartilage due to loss of the rubber-like consistency normally provided by proteoglycans.

Question 16

Which of the following best explains why the secondary cell wall in wood-forming plant cells contains lignin?

Accepted Answer

Lignin provides additional rigidity and resistance to compression, which is important for supporting the plant body.

Question 17

Which of the following is a function of membrane proteins in the plasma membrane?

Accepted Answer

They regulate transport, attach to cytoskeletal elements, and connect to extracellular structures.

Question 18

A mutation causes a loss of function in integrin proteins in an animal cell. Which of the following is the most likely consequence?

Accepted Answer

The cell will lose its ability to anchor the cytoskeleton to the extracellular matrix, affecting cell shape and stability.

Question 19

Which of the following best describes the role of pectin in the plant cell wall?

Accepted Answer

Pectin is a gelatinous polysaccharide that keeps the cell wall moist and helps glue cells together.

Cell Structure and Cell-Cell Interactions in Biology

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