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