In skeletal muscle contraction, the neurotransmitter ____ is released at the axon terminal of the neuromuscular
junction to trigger an action potential in the muscle cell.
a. troponin
b. Ca2+
c. tropomyosin
d. ATP
e. acetylcholine
ANSWER: e
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Archaeans resemble bacteria by the ____, and resemble eukaryotes by the ____
a. lack of membrane-bound organelles; presence of a nucleus b. presence of similar cell wall proteins; presence of similar rRNA sequences c. ability to perform aerobic respiration; presence of similar cell wall proteins d. lack of membrane-bound organelles; presence of introns e. presence of nucleoid region; lack of a nuclear envelope
The action of a white blood cell engulfing a bacterium is known as ____
a. pinocytosis only b. phagocytosis only c. exocytosis and phagocytosis d. endocytosis and pinocytosis e. phagocytosis and endocytosis
Carbon enters the atmosphere through all of the following sources EXCEPT ____
a. cell respiration
b. volcanic eruptions c. burning of fossil fuels d. wind erosion e. fire
An example of a secondary acquired immunodeficiency is
A. adenosine deaminase (ADA) deficiency. B. SCID. C. agammaglobulinemia. D. DiGeorge syndrome. E. AIDS.