A flowering vine plant, Gelsemium spp., includes two separate species that formerly occupied a large, common habitat area, and currently occupy overlapping areas in the southeastern United States. Gelsemium sempervirens and Gelsemium rankinii have reproductive isolation, which has allowed them to exist as separate species due to speciation.
A. postzygotic
B. prezygotic
C. parapatric
D. sympatric
E. allopatric
D. sympatric
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A microbiologist is attempting to determine the size of a microbial population and has employed several methods. She noticed that the direct count she obtained using a counting chamber and microscope was much higher than her estimate from doing a viable plate count. This discrepancy was encountered during multiple trials. What is the most likely reason for the discrepancy?
A. She counted incorrectly. B. She did not correctly do the serial dilutions prior to the viable plate count. C. The medium and growth conditions used for the viable count will not support the growth of the organisms. D. Many of the organisms viewed during the direct count may be dead. E. The organisms were not readily cultured on the viable count, either because many were dead or because the medium and growth conditions used for the viable count will not support the growth of the microorganism.
Which of the following does not occur during the third phase of glycolysis?
A. pyruvate production B. ATP synthesis C. the transfer of high-energy electrons to NAD+ D. oxygen consumption E. None of the answer options is correct.
Four of the five indicate that evolution by natural selection is a plausible mechanism leading to the
diversity of species that have and do exist. Select the exception.
a. artificial selection b. Darwin's finches c. insect resistance to pesticides d. a parent's traits developed through life are passed on to offspring via natural selection e. biogeographical patterns in species
The second law of thermodynamics states that
a. energy can be transformed into matter, and because of this, something is obtained for nothing. b. energy can be destroyed during nuclear reactions such as those that occur inside the sun. c. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature. d. energy tends to flow from concentrated to less concentrated forms. e. none of these is true.