A _____ strip between agutting endodermal cell walls forces water and solutes to move through these cells rather than around them
a. cutin c. cohesion
b. Casparian d. cellulose
B
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Do all cells of the body express the same genes?
A. No, since they don't all need to make the same proteins B. No, since they don't contain the same DNA C. Yes, since they all contain the same DNA D. Yes, since they all make the same proteins
Which of the following illustrate(s) ventilation?
a. bailing water over the gills b. movement of water past cells by using flagella c. moving air in and out of lungs d. tracheal exchanges e. all of these
Disease in which a person's immune system attacks a person's own cells is known as
A. immunodeficiency diseases. B. autoimmune diseases. C. allergic reactions. D. rejection responses.
Which of the following statements is true?
(a) Extracellular signal molecules that are hydrophilic must bind to a cell-surface receptor so as to signal a target cell to change its behavior. (b) To function, all extracellular signal molecules must be transported by their receptor across the plasma membrane into the cytosol. (c) A cell-surface receptor capable of binding only one type of signal molecule can mediate only one kind of cell response. (d) Any foreign substance that binds to a receptor for a normal signal molecule will always induce the same response that is produced by that signal molecule on the same cell type.