Dinoflagellates, apicomplexans, and ciliates are placed in the clade Alveolata because they all
a. have flagella or cilia.
b. are parasites of animals.
c. are found exclusively in freshwater or marine habitats.
d. have mitochondria.
e. have membrane-bounded sacs under their plasma membrane
Ans: e. have membrane-bounded sacs under their plasma membrane
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A system at chemical equilibrium _____
A) consumes energy at a steady rate B) releases energy at a steady rate C) consumes or releases energy, depending on whether it is exergonic or endergonic D) has zero kinetic energy E) can do no work
What percentage of carbon emissions remain in the atmosphere?
A) 5 percent B) 15 percent C) 50 percent D) 90 percent
Describe how testosterone concentrations are regulated by negative feedback mechanisms. What will be an ideal response?
About 3 million years ago, the Isthmus of Panama (a narrow strip of land connecting North and South America) formed, dividing marine organisms into Pacific and Caribbean populations. Researchers have examined species of snapping shrimp on both sides of the isthmus. Based on the morphological species concept, there appeared to be seven pairs of species, with one species of each pair in the Pacific and the other in the Caribbean. The different species pairs live at somewhat different depths in the ocean. Using mitochondrial DNA sequences, the researchers estimated phylogenies and found that each of these species pairs, separated by the isthmus, were indeed each other's closest relatives. The researchers investigated mating in the lab and found that many species pairs were not very
interested in courting with each other, and any that did mate almost never produced fertile offspring. (N. Knowlton, L. A. Weigt, L. A. Solorzano, D. K. Mills, and E. Bermingham. 1993. Divergence in proteins, mitochondrial DNA, and reproductive incompatibility across the Isthmus of Panama. Science 260:1629-32.) Refer to the paragraph about the formation of the Isthmus of Panama. The sister populations on opposite sides of the isthmus are true species under which species concept? A. the phylogenetic species concept B. both the morphological species and phylogenetic species concepts C. the morphological species concept D. the biological species concept E. the morpholoogical species, biological species, and phylogenetic species concepts