Which of the following correctly shows a possible order of events resulting in allopatric speciation?
A. postzygotic reproductive isolation - geographic isolation - natural selection
B. geographic isolation - prezygotic reproductive isolation - genetic drift
C. geographic isolation - natural selection - prezygotic reproductive isolation
D. natural selection - postzygotic reproductive isolation - geographic isolation
E. natural selection - prezygotic reproductive isolation - postzygotic reproductive isolation
Answer: C. geographic isolation - natural selection - prezygotic reproductive isolation
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Which of the following statements about "excitable membranes" is correct? (Select all correct choices.)
A. Cells spend a significant amount of energy to pump Na+ out of muscle cells at rest. B. The difference in charge across a plasma membrane is called a membrane potential. C. Acetylcholine released from a nerve cell binds to a ligand-gated ion channel at the plasma membrane of a muscle cell. D. An excitable membrane at rest has a high concentration of Cl- ions outside the cell, which flood into the cell upon the opening of an ion channel.
The only group of fungi to have a flagellated stage is the ____
a. Chytrids b. Ascomycetes c. Basidiomycetes d. Glomeromycetes e. Zygomycetes
The first person acknowledged to have seen living,
moving cells by using a microscope was a. Robert Hooke. b. Robert Brown. c. Galileo Galilee. d. Rudolf Virchow. e. Anton van Leeuwenhoek.
Most human infections caused by species of Rickettsia ____.
A) Are acquired from fomites B) Could be prevented by handwashing C) Are transmitted via vectors D) Are sexually transmitted