In "The Disembodied Lady," neurologist Oliver Sacks tells the story of a patient who suffered a catastrophic loss of sensory function. She said, "I feel my body is blind and deaf to itself... It has no sense of itself." The patient's nerve damage was strikingly specific. What single type of neuron most likely suffered damage?
A. rods and cones
B. gustatory receptors
C. olfactory receptors
D. proprioceptors
E. Meissner corpuscles
Answer: D
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a. Monoplacophora b. Solenogastres c. Caudofoveata d. Scaphopoda
How were mutants used to order the sevenless-Ras pathway?
A) Cells that expressed a constitutively active Ras mutant protein did not require Sevenless activation to become R7. B) Cells that expressed a constitutively active Sevenless mutant protein did not require Ras activation to become R7. C) Cells that expressed an inactive Ras mutant protein did not require Sevenless activation to become R7. D) Cells that expressed a constitutively-inactive Sevenless mutant protein did not require Ras activation to become R7.
The most common type of polyploidy in humans is ____
a. trisomy b. monosomy c. triploidy d. tetraploidy e. haploidy
The hydrologic cycle involves
A. the formation of water molecules from hydrogen and oxygen in the atmosphere. B. the manufacture of water during photosynthesis in plants. C. the consumption of water during aerobic cellular respiration. D. None of these answers is correct.