Water can be a limiting factor when measuring productivity
Indicate whether the statement is true or false.
T
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Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.
__X__ The adaptive radiation of the estimated 300 species of cichlid fish was very rapid and took place during the last 200,000 years. _____ The adaptive radiation of the Lake Victoria cichlids may have resulted from a key evolutionary innovation. _____ Speciation of the Lake Victoria cichlids was mainly sympatric. _____ The diversity of the Lake Victoria cichlids continues today because the lake is devoid of predators. _____ Many of the Lake Victoria cichlids have very specialized adaptations that allow them to occupy diverse habitats within the lake.
Which is true about superantigens?
A. They are a type of exotoxin. B. They bind to MHC class II antigen on T cells. C. They enhance specific antibody production. D. They are processed intracellularly. E. They are a type of exotoxin AND they bind to MHC class II antigen on T cells.
Promoters
a. determine the start of DNA strand separation. b. are required to end transcription. c. are a sequence of RNA nucleotides. d. are involved in determining the start of translation. e. aid in complementary base pairing.
____ may have been a source of organic monomers on early Earth
a. Venus b. Meteorites c. Volcanoes d. Stromatolites e. Comets