The type of protein that binds cells to the extracellular matrix is a(n)
A) integrin.
B) thrombospondin.
C) growth factor.
D) matrix metalloproteinase.
E) Ras protein.
Answer: A
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Polar bodies are:
A. haploid cells. B. functional gametes. C. produced by mitosis. D. Answers b and c are both correct.
Fossils of Cooksonia, which date to approximately ____ years ago, represent the oldest known fossils of vascular
plants.
a. 1.5 billion b. 425 million c. 250 million d. 125 million e. 17 million
What is a necessary component of a powerful immune system?
A. immunological tolerance B. strict temperature homeostasis C. thousands of different Ig genes D. a large thymus gland
Ants following a trail to the sugar bowl in your kitchen are doing so because of
A. an innate knowledge of where the sugar can be found. B. a dance done by an ant in the anthill. C. chance alone. D. operant conditioning. E. a pheromone pathway laid down by previous ants.