Anchorage dependence of animal cells in vitro or in vivo depends on which of the following?
A) attachment of spindle fibers to centrioles
B) response of the cell cycle controls to signals from the plasma membrane
C) the binding of cell-surface phospholipids to those of adjoining cells
D) response of the cell cycle controls to the binding of cell-surface phospholipids
B
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Phospholipids have the ability to spontaneously form membranes when placed in water. Why was this important in the origin of life on Earth?
A. Membranes are used by cells to store genetic information. B. Membranes are used by cells to catalyze reactions. C. Membranes protect a cell from gases in the atmosphere. D. Membranes are used by cells to isolate their contents from the environment. E. Membranes protect a cell from high temperatures and pressures in the environment.
Which of the following species of Aeromonas is oxidase-positive, sucrose-positive, and can decarboxylate ornithine?
a. A. caviae b. Allium schubertii c. Aeromonas hydrophila d. A. veronii biovar veronii
Crossing over is limited to a single occurrence for a chromosome
Indicate whether the statement is true or false.
Which of the following did NOT contribute to an understanding of the immutable nature of species?
a. homologous bones b. vestigial structures c. global exploration of fauna and flora d. fossils e. genetics