Spiracles are located
a. at the insect body surface.
b. all along the tracheal system.
c. at the tissue end of a tracheal tube.
d. at the cells in contact with the tracheal tubes.
e. at the branch points along the tracheal system.
Answer: a
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Fatal familial insomnia(FFI) is a very rare prion disease of the brain. FFI has no known cure and involves progressively worsening insomnia, which eventually leads to hallucinations, delirium, and dementia-like symptoms. The average age of diagnosis is about 40 years of age and the average life span after diagnosis is 18 months. FFI is not caused by an infection, but is inherited in an autosomal dominant fashion. Knowing its inheritance pattern AND knowing it is a prion disease, which of the following is accurate?
A. Individuals with FFI have inherited a gene that encodes a mutant form of a prion protein that folds abnormally. B. The abnormal prion protein gradually converts the normal prion proteins of the brain into abnormal prion proteins. C. The abnormal proteins do not get degraded and they form aggregates in brain cells. D. An individual who inherits one copy of the mutant allele will show the FFI phenotype. E. All of these are correct.
About 2/3 of a shark's brain is used for:
a. control of body movement. b. processing electrical currents from the water. c. olfaction. d. vision. e. processing water pressure differences.
Based on the population pyramid shown above, you would expect the Indian population to
The diagrams above show the age structures of India, the United States, and China.
A. decrease over time because births are low.
B. stay constant.
C. decrease because the death rate is higher than the birthrate.
D. grow but not stabilize.
E. grow and then begin to stabilize.
The main features that place Homo habilis in the genus Homo rather than Australopithecus are
A. hand grip, extensive use of tools, and house-building. B. care of young and altruistic behavior. C. human facial appearance and lack of hair. D. brain size, dentition, and tool use. E. advanced use of language and total carnivorous diet.