ESSENTIAL CELL BIOLOGY, FOURTH EDITION
CHAPTER 20: CELL COMMUNITIES: TISSUES, STEM CELLS, AND
CANCER
© 2014 GARLAND SCIENCE PUBLISHING
Extracellular Matrix and Connective Tissues
20-1 Both multicellular plants and a
...
ESSENTIAL CELL BIOLOGY, FOURTH EDITION
CHAPTER 20: CELL COMMUNITIES: TISSUES, STEM CELLS, AND
CANCER
© 2014 GARLAND SCIENCE PUBLISHING
Extracellular Matrix and Connective Tissues
20-1 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.
20-2 For each of the following sentences, fill in the blanks with the best word or phrase
selected from the list below. Not all words or phrases will be used; use each word or
phrase only once.
Plants are sedentary and thus their cells have different needs from those of cells found in
motile animals. For example, in plant cells, __________________ generates the turgor
pressure that drives cell growth. Plants have cell walls, but cell growth is possible in the
developing tissue because the __________________ cell walls are expandable. The
__________________ cell walls are deposited once growth has stopped, and can be
specially adapted to their function. Fibers made from __________________ (the most
abundant organic macromolecule on Earth) are found in plant cell walls, and provide
tensile strength. In woody tissues, the __________________ in the cell walls makes the
tissue more rigid and waterproof. The deposition of the cell wall is directed by the
__________________ cytoskeleton.
actin lignin pectin
cellulose membranous primary
collagen microtubule secondary
epidermis nuclear tertiary
lamin osmosis
20-3 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.
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