Active chemicals found in chocolate, tea, coffee, and
soft drinks are examples of which of the following?
a. depressants
b. stimulants
c. analgesics
d. hallucinogens
e. antipsychotics
Answer: b
Biology & Microbiology
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Oxygen did not accumulate in the early atmosphere until it reacted with reduced materials, especially ________, in the oceans
A) hydrogen B) elemental sulfur C) ferrous iron D) nitrate
Biology & Microbiology
The skin is an example of a(n) ____________________ membrane. Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology
Which sturcture makes proteins using coded instructions that come from the nucleus?
A. Golgi Apparatus B. mitochondrion C. vacuole D. ribosome
Biology & Microbiology
Histone tail modifications establish and maintain the different chromatin structures found in heterochromatin and euchromatin.
a. true b. false
Biology & Microbiology