Which of the following is NOT a way that bacteria benefit humans?
A. production of foodstuffs such as cheese
B. production of antibiotics
C. breaking down wastes, toxins, explosives, and petrochemicals
D. killing harmful insects
E. transferring nutrients across intestinal membranes
E. transferring nutrients across intestinal membranes
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The biological basis of nicotine addiction is that nicotinic receptors bind
A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings. B) postsynaptic receptors that normally bind endorphins. C) the dopaminergic receptor, releasing acetylcholine, which causes the pleasurable feelings. D) the pleasure center in the brain.
The ______ ____ is where nerves cross over in the eye
Fill in the blank(s) with the appropriate word(s).
Freshwater aquatic organisms are faced with the problem of preventing excessive uptake or retention of water
Indicate whether the statement is true or false
Peristalsis refers to waves of muscular contractions Indicate whether the statement is true or false