In plant cells, the ____ provides cellular support and protects cells from pathogens
a. cytoplasm
b. cell membrane
c. cytoskeleton
d. plasmodesmata
e. cell wall
E
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Which of the following is most likely to occur when a tumor-suppressor gene is mutated?
A. The tumor-suppressor gene may be overactive. B. The resulting tumor-suppressor protein would further suppress cell proliferation. C. The resulting tumor-suppressor protein would activate an oncogene. D. The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. E. None of the choices are possible.
Instinctive behaviors are ____, while learned behaviors are ____
a. acquired from observation; acquired from practice b. taught by parents; acquired from trial and error c. incomplete the first few times they are displayed; apparently a product of reason d. genetically programmed responses; dependent upon experience e. dependent upon experience; genetically programmed responses
The above photomicrograph is of
a. mycelium. b. protistans. c. mycorrhizae. d. stolons. e. rhizoids.
Aerobic respiration evolved in
a. some bacteria. b. some archea. c. animals. d. mitochondria. e. in some bacteria and some archea.