The repeated use of which drug leads to the body decreasing the natural production of endorphins?

A. methamphetamine
B. heroin
C. ecstasy
D. marijuana
E. K2


Answer: B

Biology & Microbiology

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Nitrification ____

a. converts ammonium into nitrates b. reduces nitrates to nitrites c. converts nitrogenous compounds into free nitrogen d. converts atmospheric nitrogen to ammonia e. reduces ammonia to ammonium

Biology & Microbiology

Which is a property of unsaturated fats?

a. They are more common in animals. b. They are generally liquid at room temperature. c. They have no double bonds in the carbon chains of their fatty acids. d. They have fewer fatty acids per fat molecule than do saturated fats. e. They contain more hydrogen than do saturated fats having the same number of carbon atoms.

Biology & Microbiology

Primary healing of tissue occurs in a disorderly fashion.

a. true b. false

Biology & Microbiology

Which of the following types of microbes might be found in a boiling hot spring?

A. hyperthermophiles B. phototrophic bacteria C. methanogens D. non-thermophiles E. halophiles

Biology & Microbiology