The most dangerous outcome of a Taenia solium infection occurs when
A. larvae cross the placenta.
B. eggs are ingested.
C. larvae enter the body through intact skin.
D. cysticerci are ingested.
E. the host immune system fails to react against it.
Answer: B
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Mutations occur:
A. in every cell. B. in somatic cells, but not in germ line cells. C. in germ line cells, but not in somatic cells. D. during development but not during adulthood.
Which tissue type is most likely to become
cancerous?
a. connective b. muscular c. epithelial d. neural e. adipose
Hawthorn maggot flies that breed on native hawthorns or introduced European apples can mate in the lab, but rarely mate in the wild. This is an example of _____ reproductive isolation.
A. postzygotic B. prezygotic C. allopatric D. sympatric E. outgroup
Normally, the mold Neurospora can synthesize all 20 amino acids. A certain strain of this mold cannot grow in minimal nutritional medium, but grows only when the amino acid leucine is added to the medium. This strain
A. has a mutation in the gene that encodes the leucine tRNA B. has a mutation in the gene that encodes the enzyme that "charges" the leucine tRNA\ C. is dependent on leucine for energy D. has a mutation affecting the biochemical pathway leading to the synthesis of leucine