ESSENTIAL CELL BIOLOGY (LITTLE
FOCUS ON CANCER SECTIONS)
CHAPTER 20 EXAM QUESTIONS WITH
CORRECT ANSWERS
C. Fibronectin - ANSWER-A fibroblast can attach indirectly to collagen via which type of
protein?
A. Proteoglycan
B. Cadherin
C. Fibronectin
D. Integrin
D. Proteoglycans - ANSWER-In the extracellular matrix of animal tissues, which of the
following molecules allows the matrix to resist compression?
A. Integrin
B. Collagen
C. Fibronectin
D. Proteoglycans
B. The negative charges on glycosaminoglycans attract sodium ions, which in turn draw
a large amount of water into the extracellular matrix. - ANSWER-Which feature of
glycosaminoglycans allows the extracellular matrix in cartilage to resist compression?
A. Glycosaminoglycans are typically attached to proteins, and together these molecules
help fill the space of the extracellular matrix.
B. The negative charges on glycosaminoglycans attract sodium ions, which in turn draw
a large amount of water into the extracellular matrix
C. Glycosaminoglycans form stiff rods in the extracellular matrix.
A. True - ANSWER-Cells joined together in epithelial sheets line all external and internal
surfaces of the animal body.
A. True
B. False
B. The basal lamina lines the inside of epithelia cells at the basal membrane surface -
ANSWER-Which of the following is NOT true of the basal lamina?
A. The basal lamina is a thin tough sheet of extracellular matrix
B. The basal lamina lines the inside of epithelia cells at the basal membrane surface
C. The basal lamina contains a specialized type of collagen (type IV collagen).
C. Tight junctions - ANSWER-Which epithelial cell junctions serve to seal neighboring
cells together so that water-soluble molecules cannot easily leak between them?
A. Desmosomes
, B. Gap junctions
C. Tight junctions
D. Adherens junctions
B. link epithelial cells together by binding to similar cadherins in adjacent epithelial cells
- ANSWER-Cadherin proteins:
A. create an electrical and metabolic coupling between epithelial cells
B. link epithelial cells together by binding to similar cadherins in adjacent epithelial cells
C. allow ions and small molecules to pass from one plant cell to another
D. anchor epithelial cells to the basal lamina.
D. Adherens junction - ANSWER-Which type of epithelial junction plays a role in an
epithelial sheet's ability to develop tension or change its shape by contraction?
A. Desmosome
B. Gap junction
C. Tight junction
D. Adherens junction
B. Intermediate filaments - ANSWER-In desmosomes, cadherin molecules are
anchored inside an epithelial cell to which type of cytoskeletal filament?
A. Microtubules
B. Intermediate filaments
C. Actin filaments
B. hemidesmosomes. - ANSWER-Epithelial cells are attached to the basal lamina by:
A. desmosomes
B. hemidesmosomes
C. cadherins
D. tight junctions.
B. They allow ATP-driven pumps to move substances from one cell to another. -
ANSWER-Which of the following is NOT true of gap junctions?
A. They allow inorganic ions and small water-soluble molecules to move directly
between cells
B. They allow ATP-driven pumps to move substances from one cell to another
C. They allow an electrical and a metabolic coupling between the cells. They may be
opened or closed as needed.
A. Plasmodesmata - ANSWER-Which of the following is the plant equivalent of a gap
junction?
A. Plasmodesmata
B. Adherens junctions
C. Tight junctions
D. Desmosomes
B. False - ANSWER-All tissues are renewed at the same rate.
FOCUS ON CANCER SECTIONS)
CHAPTER 20 EXAM QUESTIONS WITH
CORRECT ANSWERS
C. Fibronectin - ANSWER-A fibroblast can attach indirectly to collagen via which type of
protein?
A. Proteoglycan
B. Cadherin
C. Fibronectin
D. Integrin
D. Proteoglycans - ANSWER-In the extracellular matrix of animal tissues, which of the
following molecules allows the matrix to resist compression?
A. Integrin
B. Collagen
C. Fibronectin
D. Proteoglycans
B. The negative charges on glycosaminoglycans attract sodium ions, which in turn draw
a large amount of water into the extracellular matrix. - ANSWER-Which feature of
glycosaminoglycans allows the extracellular matrix in cartilage to resist compression?
A. Glycosaminoglycans are typically attached to proteins, and together these molecules
help fill the space of the extracellular matrix.
B. The negative charges on glycosaminoglycans attract sodium ions, which in turn draw
a large amount of water into the extracellular matrix
C. Glycosaminoglycans form stiff rods in the extracellular matrix.
A. True - ANSWER-Cells joined together in epithelial sheets line all external and internal
surfaces of the animal body.
A. True
B. False
B. The basal lamina lines the inside of epithelia cells at the basal membrane surface -
ANSWER-Which of the following is NOT true of the basal lamina?
A. The basal lamina is a thin tough sheet of extracellular matrix
B. The basal lamina lines the inside of epithelia cells at the basal membrane surface
C. The basal lamina contains a specialized type of collagen (type IV collagen).
C. Tight junctions - ANSWER-Which epithelial cell junctions serve to seal neighboring
cells together so that water-soluble molecules cannot easily leak between them?
A. Desmosomes
, B. Gap junctions
C. Tight junctions
D. Adherens junctions
B. link epithelial cells together by binding to similar cadherins in adjacent epithelial cells
- ANSWER-Cadherin proteins:
A. create an electrical and metabolic coupling between epithelial cells
B. link epithelial cells together by binding to similar cadherins in adjacent epithelial cells
C. allow ions and small molecules to pass from one plant cell to another
D. anchor epithelial cells to the basal lamina.
D. Adherens junction - ANSWER-Which type of epithelial junction plays a role in an
epithelial sheet's ability to develop tension or change its shape by contraction?
A. Desmosome
B. Gap junction
C. Tight junction
D. Adherens junction
B. Intermediate filaments - ANSWER-In desmosomes, cadherin molecules are
anchored inside an epithelial cell to which type of cytoskeletal filament?
A. Microtubules
B. Intermediate filaments
C. Actin filaments
B. hemidesmosomes. - ANSWER-Epithelial cells are attached to the basal lamina by:
A. desmosomes
B. hemidesmosomes
C. cadherins
D. tight junctions.
B. They allow ATP-driven pumps to move substances from one cell to another. -
ANSWER-Which of the following is NOT true of gap junctions?
A. They allow inorganic ions and small water-soluble molecules to move directly
between cells
B. They allow ATP-driven pumps to move substances from one cell to another
C. They allow an electrical and a metabolic coupling between the cells. They may be
opened or closed as needed.
A. Plasmodesmata - ANSWER-Which of the following is the plant equivalent of a gap
junction?
A. Plasmodesmata
B. Adherens junctions
C. Tight junctions
D. Desmosomes
B. False - ANSWER-All tissues are renewed at the same rate.
