If you experimentally increase the concentration of Na+ outside a cell while maintaining other ion concentrations as they were, what would happen to the cell's membrane potential?
A) The membrane potential would decrease.
B) The membrane potential would increase.
C) The membrane potential would be unaffected.
D) The answer depends on the thermodynamic potential.
B
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Which of the following cells is associated with the humoral immune response?
a. T cells b. B cells c. phagocytic cells d. natural killer cells
During the first major divergence of life, the atmosphere was ____
a. high in oxygen, high in carbon dioxide b. high in hydrogen, low in oxygen c. changing from anaerobic to aerobic d. firmly in the age of aerobes e. high in oxygen, low in carbon dioxide
The use of "suicide" genes in genetically modified organisms is designed to
A) prevent the growth of the modified organisms in the environment. B) kill the modified organisms before they are released in the environment. C) delete genes necessary for modified organism's growth. D) provide for resistance of the modified organisms to pesticides. E) provide a means to eliminate non-modified organisms.
If a codon for alanine is GCA. What is the anticodon?
A) ACG B) GCA C) CGU D) CGT E) UGC