Which of the following is an example of natural selection that has been seen in our lifetime?
A. the evolution of antibiotic-resistant bacteria
B. feeding habits of finches
C. the domain Archaea
D. a rise in the incidence of malaria
A. the evolution of antibiotic-resistant bacteria
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Haustorial roots of dodders and other nonphotosynthetic, parasitic plants rob the host plant of ____
a. sugars only b. minerals only c. water only d. sugars and minerals only e. sugars, minerals, and water
Which of the following accounts for the fluid aspect of the fluid mosaic model of plasma membranes?
A) The individual phospholipid molecules are not bonded to one another, so the movement of certain proteins and lipids is possible within and through the bilayer. B) The plasma membrane is "fluid" because of the movement of substances across the membrane. C) One of the components of the membrane is water. D) The membrane is water soluble. E) The bilayer permits diffusion of certain lipid-soluble substances.
A floodplain is an area adjacent a stream or river that experiences flooding during periods of high discharge. These ecosystems can be very rich in both quantity and diversity of organisms and can contain up to 1,000 times more species than a river. Many floodplains have been compromised by the construction of levees, pollution, and the draining of wetlands and marshes. A restoration project that focuses its efforts on the removal of levees and the improvement of water quality, is a plan focused on
A. restoration of species. B. restoration of ecosystem functioning.
All of the following are said to be filled with empty
calories (i.e., low vitamin and fiber) EXCEPT a. processed white flour. b. processed white sugar. c. brown rice. d. corn syrup. e. all of these.