Which one of the following characterizes cancer cells?
a. Mitosis is strictly regulated.
b. Cancer cells form tumors that strongly adhere to surrounding tissues.
c. Cancer cells display uncontrolled cell division.
d. Tumors formed by cancer cells remain encapsulated and only grow in one location.
e. Cancer cells behave like normal cells.
C
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In the vascular bundles of most dicot stems, primary phloem differentiates toward the ________of the stem, while primary xylem differentiates toward the ________of the stem.
A. middle; outside B. cork cambium; vascular cambium C. outside; middle D. shoot tip; roots E. middle; middle
Which of the following statements about signal propagation is true?
a. Signaling pathways are simple and linear. b. Signaling pathways can randomly be disrupted by internal errors and will automatically reset. c. Signaling pathways can get very complicated because most cellular proteins can affect different downstream events. d. Mutations have no effect on propagation of signaling pathways.
A "nucleus" is the name for both the spherical center of a cell and:
A) the gaps between the segments of myelin B) the last cranial nerve C) a collection of cell bodies D) the basal ganglia
Which of the following is not one of the functions of the cytoskeleton?
a. To provide a structural framework for the cell b. Cell locomotion c. Protein translocation into the ER d. Intracellular movement of organelles and other structures