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
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
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.