Which of the following would you expect to happen if you added EGF to a cell extract from which only the plasma membrane fraction has been removed?
A) cAMP will be produced.
B) Gs? will be activated.
C) Adenylyl cyclase will be activated.
D) Calcium ions will be released.
E) None of the above will happen.
Answer: E
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In studying the medium ground finch on Daphne Major, the Grants noted that each generation of finches had beaks
A. best suited for their parents' environment. B. best suited for their current environment. C. smaller than those of the previous generation. D. larger than those of the previous generation.
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.
The main force that moves blood throughout the system of blood vessels is
a. arterial blood pressure. b. skeletal muscle action. c. smooth muscle action. d. valve action. e. venous blood pressure.
The total energy producers store in a given amount of time is referred to as____
a. photosynthetic flow b. primary productivity c. energy flow d. energy production e. biomass flow