Which of the following statements about the Ey transcriptional regulator is false?
(a) Expression of Ey in cells that normally form legs in the fly will lead to the formation of an eye in the middle of the legs.
(b) The Ey transcription factor must bind to the promoter of every eye-specific gene in the fly.
(c) Positive feedback loops ensure that Ey expression remains switched on in the developing eye.
(d) A homolog of Ey is found in vertebrates; this homolog is also used during eye development.
(b) Ey turns on the transcription of other transcriptional regulators; it is the combined action of the genes directly regulated by Ey and the genes regulated by the regulators that Ey turns on that forms the eye.
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Which of the following mechanisms may be responsible for the occurrance of exon shuffling?
A. double crossover could promote the insertion of an exon into another gene. B. nonhomologous recombination. C. transposable elements may promote the movement of exons. D. both nonhomologous recombination and transposable elements. E. none of these are mechanisms responsible for exon shuffling.
Cyclosporiosis is transmissable from person to person
Indicate whether this statement is TRUE or FALSE.
Coral reefs found very close to the shore of islands and continents are called:
a. atolls. b. barrier reefs. c. table reefs. d. fringing reefs.
A(n) ____ character is a trait that has evolved relatively recently
a. derived b. ancestral c. cladistic d. homologous e. polyphyletic