A drug with a high therapeutic index would have a ______ toxic dose and a ______ therapeutic dose.
A. low; low
B. low; high
C. high; high
D. high; low
D. high; low
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Which region contains the largest amount of the global phosphorus pool?
A) fossil fuels B) aboveground terrestrial systems C) ocean D) atmosphere
As water boils and turns to steam, what happens to the hydrogen bonds?
a. The hydrogen bonds break. b. The hydrogen bonds become stronger. c. The hydrogen bonds generate additional bonds. d. The hydrogen bonds form a crystalline lattice structure. e. The hydrogen bonds continually break and join together again.
Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. many ancestral bird species colonized each island. B. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations. C. each bird species evolved different adaptations in allopatry and then colonized the other islands. D. one bird species colonized each island and then evolved into distinct species on that island through character displacement.
DNA and RNA are alike in that they _____________.
A. both have same pentose sugar B. use the same nitrogenous bases to assemble the genetic code C. have the same number of strands D. both contain nucleotides E. are both made in the cytoplasm