Alzheimer's disease and Parkinson's disease are both neurological diseases that result from ____
a. lack of acetylcholine production
b. abnormal levels of specific neurotransmitters
c. failure to remove neurotransmitters from the synaptic cleft
d. too much dopamine production
e. a failed reuptake of specific neurotransmitters
ANSWER: b
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What would the result be if a drug that blocks the action of polymerase was introduced into a virus-infected organism?
A) The virus would not be able to enter new host cells. B) The viral proteins would not be made and the virus would not be able to reproduce. C) The newly formed virions (virus particles) would be unable to leave the host cell. D) Viral proteins and viral DNA particles would not be able to be assembled.
Action potentials are propagated in a one-way direction down a neuronal plasma membrane because ____
a. the action potential is of insufficient intensity to stimulate the voltage-gated ion channels behind it b. the adjacent channels upstream from the action potential are ligand-gated c. the adjacent channels upstream from the action potential are in a refractory period d. voltage-gated ion channels are suppressed e. the adjacent channels upstream from the action potential are at their threshold potential
Most of the water vapor in the Earth's atmosphere comes from evaporation from ____
a. lakes b. rivers c. land d. oceans e. plants
Which of the following is false about human
kidneys? a. Each has more than one million nephrons. b. They filter about 180 liters of fluid from the blood every day. c. An individual can live a normal life even if one kidney is nonfunctional or surgically removed. d. Two sets of blood capillaries are associated with each nephron. e. None of these are false.