Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by
A. blocking serotonin reuptake from synapses.
B. blocking the enzyme acetylcholinesterase.
C. binding to the GABA receptor to enhance inhibitory neurotransmission.
D. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes.
E. blocking norepinephrine and dopamine reuptake from synapses.
Answer: E
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Which of the following statements is an accurate combination of postulates 1 and 2 of natural selection?
A. Environmental variation exists for traits among individuals in a population. B. Heritable variation does not exist among individuals in a population. C. Heritable variation exists for traits among individuals in a population. D. Drug resistance exists among all individuals in a population.
Microorganisms may possibly adapt to which of the following conditions?
a. selective pressures exerted by chemicals b. high temperatures c. extremely low temperatures d. extremely dry and hot seasons e. all of these
Why is the second stage of a dengue infection of concern?
A) Vomiting can lead to dehydration. B) Nausea can be a symptom of the virus getting past the blood brain barrier, infecting the brain, and quickly killing the patient. C) Body aches and extreme abdominal pain can indicate an intestinal perforation. D) A high fever can lead to dehydration. E) Hemorrhagic features may develop and lead to shock, organ failure, and eventually death.
Flowering plants use animals or wind to transfer ________ between flowers.
A. megaspores B. ovules C. pollen D. seeds E. microspores