Which drug, when taken by an adult, will produce similar symptoms as the symptoms of a child with ADD?
A) alcohol
B) ecstasy
C) marijuana
D) nicotine
C
Biology & Microbiology
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The SOS regulatory system is activated by
A) the activity of DNA polymerase IV. B) DNA damage. C) transcription of LexA. D) repression of RecA.
Biology & Microbiology
Inside root cells, ____ is converted to ____, which is then rapidly used to synthesize organic
molecules.
a. NH4 +; NO3 ? b. N2; NO3 ? c. NO3 ?; NH4 + d. NH3; NH4 + e. NO3 ?; N2
Biology & Microbiology
Which structure allows this organism to move?
A) cytoplasm B) cell membrane C) flagellum D) organelles
Biology & Microbiology
In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a diploid zygote; the other fuses with the central cell, forming a triploid cell.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology