Question 1

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

Accepted Answer

It provides structural support and helps cells attach to one another.

Question 2

A scientist treats plant cells with a chemical that inhibits the production of pectin. Which of the following is the most likely consequence?

Accepted Answer

The plant cells will be unable to maintain turgor pressure and may become less rigid.

Question 3

Which of the following statements about desmosomes is correct?

Accepted Answer

Desmosomes connect the cytoskeletons of adjacent animal cells, providing strong adhesion.

Question 4

Which molecule is the primary fibrous component of the extracellular matrix in animal tissues?

Accepted Answer

Collagen

Question 5

A mutation causes a plant to be unable to produce expansins. What is the most likely effect on the plant?

Accepted Answer

The plant cells will be unable to grow properly due to rigid cell walls.

Question 6

Which of the following best explains why tight junctions are important in epithelial tissues?

Accepted Answer

They prevent the leakage of fluids between cells, maintaining distinct tissue compartments.

Question 7

Which of the following structures is responsible for connecting the cytoplasm of adjacent plant cells, allowing the exchange of small molecules?

Accepted Answer

Plasmodesmata

Question 8

In an experiment, antibodies are used to block cadherin proteins in a tissue sample. What is the most likely outcome?

Accepted Answer

Cells will lose their ability to adhere specifically to cells of the same type.

Question 9

Which of the following best describes the difference between the primary and secondary cell walls in plants?

Accepted Answer

The primary cell wall is flexible and allows growth, while the secondary cell wall is more rigid and provides additional support.

Question 10

Which of the following is a function of integrins in animal cells?

Accepted Answer

They anchor the cytoskeleton to the extracellular matrix.

Question 11

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

Accepted Answer

Difficulty in stretching and recoiling of lung tissue during breathing.

Question 12

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

Accepted Answer

It glues adjacent plant cells together using gelatinous pectins.

Question 13

Which of the following is true about gap junctions in animal cells?

Accepted Answer

They form protein channels that allow the flow of small molecules and ions between adjacent cells.

Question 14

Which of the following is a key difference between bacterial and archaeal cell walls?

Accepted Answer

Bacterial cell walls contain peptidoglycan, while archaeal cell walls lack peptidoglycan and often have an S-layer of proteins.

Question 15

A mutation in a plant causes the primary cell wall to lack cellulose microfibrils. Which of the following would most likely occur?

Accepted Answer

The plant cells would be unable to maintain their shape and resist turgor pressure.

Question 16

Which of the following best explains why selective adhesion is important in multicellular organisms?

Accepted Answer

It allows cells to bind only to cells of the same type, ensuring proper tissue formation.

Question 17

Which of the following is a correct statement about 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.

Question 18

Which of the following best describes the function of proteoglycans in the animal extracellular matrix?

Accepted Answer

They contribute to the ground substance, giving cartilage its rubber-like consistency.

Question 19

A patient is diagnosed with a condition where their epithelial cells cannot form tight junctions. Which of the following symptoms would you most likely expect?

Accepted Answer

Increased leakage of fluids between tissue compartments.

Cell-Cell Interactions: Structure, Function, and Communication in Multicellular Organisms

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