Biology 11 12

11) Which component is a protein fiber of the extracellular matrix?

A) A

18) In plant cells, the middle lamella _____.

A) allows adjacent cells to adhere to one another

14) Scientists have found that extracellular matrix components may induce specific gene expression in embryonic tissues such as the liver and testes. For this to happen there must be direct communication between the extracellular matrix and the developing cells. Which kind of transmembrane protein would most likely be involved in this kind of induction?

A) integrins

5) One characteristic of life and living systems is that they are able to adapt. In general, cells interact with other cells and their environment through the action of their _____.

A) plasma membrane and extracellular matrix

8) What is a major difference between the extracellular matrix (ECM) of a plant cell and the ECM of an animal cell?

B) Plant ECM is primarily carbohydrate in nature, whereas animal ECM is mainly proteins.

13) Integrins are integral membrane proteins. They are often attached to _____.

B) cytoskeletal proteins and proteins in the extracellular matrix

9) Osteocytes are bone cells. Collagen fibers and calcium salts are found in abundance between and among the osteocytes. The collagen and calcium salts are _____.

B) part of the extracellular matrix

17) For a tissue or an organ to function as a unit, _____.

B) there must be cell-cell communication among the cells within a tissue or organ

7) Which of the following statements is FALSE?

C) A plant cell continues growing after the secondary cell wall forms but stops growing with the formation of the tertiary cell wall.

10) All of the following proteins may be found in the extracellular matrix of animal cells EXCEPT _____.

C) actin

6) Which of the following would you NOT find in a plant cell?

C) collagen

15) Plasmodesmata in plant cells are most similar in function to which of the following structures in animal cells?

C) gap junctions

4) Signals from the extracellular matrix to the cytoskeleton may be transmitted by _____.

C) integrins

12) The extracellular matrix is thought to participate in the regulation of animal cell behavior by communicating information from the outside to the inside of the cell via which of the following?

D) integrins

What do the cell walls of plants and the extracellular matrix of animal cells have in common?

E) They have functional connections with the cytoskeleton inside the cell.

16) Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through _____.

E) gap junctions

A mutation that disrupts the ability of an animal cell to add polysaccharide modifications to proteins would most likely cause defects in its _____.

Golgi apparatus and extracellular matrix

2) The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is a characteristic common to all of these extracellular structures?

They are constructed of polymers that are synthesized in the cytoplasm and then transported out of the cell.