Two or more alleles of a gene present at relatively high frequencies in a population's gene pool is known as ____.
A. disruptive selection
B. sexual dimorphism
C. directional selection
D. stabilizing selection
E. balanced polymorphism
Answer: E
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The phenomenon of "glucose sparing" depends most critically on
A. glycogenolysis. B. protein synthesis. C. lipolysis. D. lipogenesis. E. glucose polymer formation.
The C4 cycle ____
a. replaces the second stage of the Calvin cycle b. supplements the activity of rubisco by providing a second source of 3PGA for the reduction stage of the Calvin cycle c. is more efficient than the Calvin cycle because less ATP is consumed in the process d. ensures that CO2 is provided to rubisco and thus prevents photorespiration e. is most commonly associated with plants living in humid climates
Cartilage injuries do not repair themselves because ________. a. All of these choices are reasons cartilage injuries do not repair themselves
b. cartilage does not receive nutrients very easily c. cartilage does not contain blood vessels d. None of these are reasons as cartilage does heal itself. e. cartilage does not divide in adults
Which of the following is a characteristic of an adult tunicate?
a. pharyngeal slits b. notochord c. post-anal tail d. dorsal hollow nerve cord