Molecular Biology of the Cell Chapter 019 Test Quiz Bank With Verified Questions & Answers 2023/2024
Both multicellular plants and animals have
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(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. [Show Less]