Which of the following events occurs last in an action potential?
a. Opening of voltage-gated Na+ channels
b. Closing of voltage-gated Na+ channels
c. Opening of voltage-gated K+ channels
d. Closing of voltage-gated K+ channels
Answer: d. Closing of voltage-gated K+ channels
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Atherosclerosis has its most serious effects in the ____
a. extremities b. coronary arteries c. pulmonary arteries d. brain e. heart muscle cells
The proposition that species change through time was proposed by which of the following?
a. Charles Darwin b. Jean Baptiste de Lamarck c. Alfred Russel Wallace d. Charles Darwin and Jean Baptiste de Lamarck e. Charles Darwin, Jean Baptiste de Lamarck, and Alfred Russel Wallace
Species interactions between members of a community include __________ and __________, in both of which one
species benefits at the expense of another. Fill in the blank(s) with the appropriate word(s).
You conduct an experiment in which you inactivate Ras proteins in fibroblast cells. Which of the
following is the most immediate consequence of this procedure? a. The fibroblasts synthesized excess G protein. b. The fibroblasts synthesized excess DAG. c. The fibroblasts no longer responded to calmodulin. d. The fibroblases no longer synthesized DNA in response to growth factors. e. The fibroblasts divided uncontrollably.