Approximately what percentage of new drugs produced via pharmaceutical research is derived from natural compounds?
a. 75%
b. 50%
c. 35%
d. 10%
c. 35%
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How can scientists determine what atmospheric CO2 levels were like hundreds—or even thousands—of years ago? Select all that apply
A. They can examine ice core samples from Antarctica. B. They can examine CO2 levels in the outermost layer of Earth' atmosphere. C. They can examine the number of stomata in fossilized leaves. D. They can examine the number of fossilized dinosaur skeletons from different eras.
Which of the following type of organism is always multicellular?
A. animals only B. plants only C. archae only D. prokaryotes only E. both animals and plants
The KN-1 gene in maize is normally expressed
a. in primary meristems, where it initiates the process of differentiation. b. in apical meristems, where it maintains the undifferentiated state. c. in apical meristems, where it initiates the process of differentiation. d. in primary meristems, where it maintains the undifferentiated state. e. in lateral meristems, where it initiates the process of secondary growth.
Which sequence lists the structures from largest, most inclusive, to smallest?
A) muscle-thick filament-fascicle-muscle fiber-myofibril B) muscle-fascicle-muscle fiber-myofibril-thick filament C) fascicle-muscle-myofibril-muscle fiber-thick filament D) muscle fiber-myofibril-muscle-fascicle-thick filament E) thick filament-fascicle-myofibril-muscle-muscle fiber