Molecular Biology of the Cell Chapter 019 Test Quiz Bank With Verified Questions & Answers 2023/2024
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Alberts Molecular Biology of Cell
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Alberts Molecular Biology Of Cell
Molecular Biology of the Cell Chapter 019 Test Quiz Bank With Verified Questions & Answers 2023/2024
Both multicellular plants and animals have _____________________.
(a) cells capable of locomotion.
(b) cells with cell walls.
(c) a cytoskeleton composed of actin filaments, microtubules, and ...
Molecular Biology of the Cell Chapter 019 Test Quiz Bank With
Verified Questions & Answers 2023/2024
Both multicellular plants and animals have _____________________.
(a) cells capable of locomotion.
(b) cells with cell walls.
(c) a cytoskeleton composed of actin filaments, microtubules, and intermediate filaments.
(d) tissues composed of multiple different cell types. correct answers D. Tissues composed of multiple
different cell types
Which of the following statements about plant cell walls is true?
a. The microtubule cytoskeleton directs the orientation in which cellulose is deposited in the cell wall.
b. The molecular components of the cell wall are the same in all plant tissues.
c. Because plant cell walls are rigid, they are not deposited until the cell has stopped growing.
d. The cellulose found in cell walls is produced as a precursor molecule in the cell and delivered to the
extracellular space by exocytosis. correct answers a. The microtubule cytoskeleton directs the
orientation in which cellulose is deposited in the cell wall.
Which of the following molecules is not found in plants?
a. cellulose
b. lignin
c. collagen
d. pectin correct answers c. collagen
Which of the following statements about cellulose is true?
a. Cellulose synthase enzyme complexes are integral membrane proteins.
b. An array of microtubules guides the cellulose synthase complex as it moves in the membrane.
c. The sugar monomers necessary for the synthesis of the cellulose polymer are transported across the
plasma membrane
d. Microtubules are directly attached to the outside surface of the plasma membrane to form tracks that
help orient the cellulose polymers. correct answers d. Microtubules are directly attached to the outside
surface of the plasma membrane to form tracks that help orient the cellulose polymers.
Which of the following is not an example of connective tissue?
a. bone
b. the layer of photoreceptors in the eye
c. the jellylike interior of the eye
d. cartilage correct answers b. the layer of photoreceptors in the eye
Which of the following statements about animal connective tissues is true?
a. Enzymes embedded in the plasma membrane synthesize the collagen in the extracellular matrix
extracellularly.
b. In connective tissue, the intermediate filaments within the cells are important for carrying the
mechanical load.
c. Cells can attach to a collagen matrix by using fibronectin, an integral membrane protein.
d. Proteoglycans can resist compression in the extracellular matrix. correct answers d. Proteoglycans can
resist compression in the extracellular matrix.
, Which of the following statements about collagen is false?
a. Collagen synthase organizes the mature collagen molecules into ordered collagen fibrils.
b. Collagen is synthesized as procollagen and secreted to the outside of the cell in the secretory vesicle.
c. The terminal procollagen domains are cleaved by the protease in the extracellular space.
d. Cells can break down a collagen matrix using matrix proteases. correct answers a. Collagen synthase
organizes the mature collagen molecules into ordered collagen fibrils.
Fibroblasts organize the collagen of the extracellular matrix by
a, cutting and rejoining the fibrils.
b. processing the procollagen into collagen
c. twisting fibrils together to make ropelike fibers.
d. pulling the collagen into sheets or cables after it has been secreted. correct answers d. pulling the
collagen into sheets or cables after it has been secreted.
A cell can crawl through a tissue because of the transmembrane ______________ proteins that can bind
to fibronectin outside of the cell.
a. integrin
b. collagen
c. gap junction
d. claudin correct answers a. integin
Which of the following statements about integrins in false?
a. Integrins use adaptor proteins to interact with the microtubule cytoskeleton.
b. Integrins can switch to an activated state by binding to an extracellular matrix molecule.
c. Integrins can switch to an activated state by binding to an intracellular protein.
d. An activated integrin molecule takes on an exteneded conformation. correct answers a. Integrins use
adaptor proteins to interact with the microtubule cytoskeleton.
Proteoglycans in the extracellular matrix of animal tissues ________________.
a. chiefly provide tensile strength.
b. allow cartilage to resist compression.
c. are linked to microtubules through the plasma membrane.
d. are polysaccharides composed of glucose subunits. correct answers a. chiefly provide tensile strength
Which of the following statements is FALSE?
a. Proteoglycans can act as filters to regulate which molecules pass through the extracellular medium.
b. The negative charge associated with proteoglycans attracts cations, which cause water to be sucked
into the extracellular matrix.
c. Proteoglycans are a major component of compact connective tissues but are relatively unimportant in
watery tissues such as the jellylike substance in the interior of the eye.
d. Glycosaminoglycans are components of proteoglycan. correct answers c. Proteoglycans are a major
component of compact connective tissues but are relatively unimportant in watery tissues such as the
jellylike substance in the interior of the eye.
A basal lamina
a. is a thin layer of connective-tissue cells and matrix underlying an epithelium.
b. is a thin layer of extracellular matrix underlying an epithelium.
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