A cancer cell is injected into a healthy mouse. The mouse develops tumors. This experiment indicates that cancer is
A) contact inhibited.
B) transplantable.
C) benign.
D) invasive.
B) transplantable.
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The rate of diffusion of molecules would be fastest in a cell with an
A. internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures. B. internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures. C. internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures. D. internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures.
"A bands" in skeletal muscle are composed of
a. discs to which thin filaments are anchored. b. stacked thick filaments along with parts of thin filaments that overlap both ends. c. thin filaments but no thick filaments. d. thick filaments but no thin filaments. e. discs to which thick filaments are anchored.
Which structure is involved in the initiation stage?
a. a specific tRNA b. an mRNA transcript c. a small ribosomal subunit d. a large ribosomal subunit e. all of these
Identify and briefly explain three adaptations of flowering plants that contributed to their evolutionary
expansion and success What will be an ideal response?