Which statement below is true about neurotransmitters?
A. The entry of neurotransmitter through K+ channels into neurons triggers the rising phase of the action potential
B. Neurotransmitters are released from muscle cells to activate motoneurons in the presence of botulinum toxin
C. Neurotransmitters are released from a neuron when action action potential reaches the end of its axon
D. All of the above
Answer: C. Neurotransmitters are released from a neuron when action action potential reaches the end of its axon
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Which of the following factors would tend to increase membrane fluidity?
A) a greater proportion of unsaturated phospholipids B) a greater proportion of saturated phospholipids C) a lower temperature D) a relatively high protein content in the membrane E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
One of the waste products that accumulates during cellular functions is carbon dioxide. It is removed via the respiratory system. What is another waste product that accumulates during normal physiological functions in vertebrates?
I) ammonia II) uric acid III) urea A) only I and III B) only II and III C) only I and II D) I, II, and III
While walking along a riverbank after a swim, you step on a sharp fruit. When you pick it up, you notice that it rattles, which indicates there is an air pocket around the seeds. How is this fruit most likely dispersed?
A) Explosively propelled B) Being eaten by animals C) Wind D) Clinging to animals E) Water
Subunit vaccines are safer than traditional vaccines because they
A) are acellular. B) are administered in food. C) do not pose a risk for causing the disease. D) are acellular and do not pose a risk for causing the disease. E) are acellular and can be administered in food.