Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 25, Problem 7TYU

MAKE CONNECTIONS The bacterium Wolbachia is a symbiont that lives in mosquito cells and spreads rapidly through mosquito populations. Wolbachia can make mosquitoes resistant to infection by Plasmodium; researchers are seeking a strain that confers resistance and does not harm mosquitoes. Compare evolutionary changes that could occur if malaria control is attempted using such a Wolbachia strain versus using insecticides to kill mosquitoes. (Review Figure 25.26 and Concept 21.3)

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According to Lynn Margulis's theory of endosymbiosis, bacteria entered large cells either as parasites or as undigested prey as illustrated. All the following are proof that mitochondria and chloroplast evolved from bacteria, except: Endosymbiosis in a nutshell: 1. Start with two 2. One bacterium engulfs the other. 3. One bacterium now lives inside the other. independent bacteria. 4. Both bacteria benefit from the arrangement. 5. The internal bacteria are passed on from generation to generation. O a they each have a double membrane they have chromosomes similar in shape to their host they are the size of bacteria their DNA is different from its host
Wolbachia is a genus of bacteria that infect cells of invertebrates. Surveys have found that up to a fifth of insect species have at least some individuals infected with Wolbachia. Pathogen or parasite? This endosymbiont (a symbiont that lives inside its host) bacteria can have many effects on its host, including killing offspring and changing the sex of offspring. Ary Hoffmann from the University of Melbourne in Australia, Michael Turelli from the University of California at Davis, and their associates have been studying Wolbachia infections in populations of Drosophila simulans from California. From the initial infection around 1980, Wolbachia infection spread northward across the state during the 1980s and 1990s. The most striking manifestation of infection in this fly species is cytoplasmic incompatibility: offspring produced in crosses where males are infected and the females are uninfected tend to die early in development. In crosses between infected males and infected females,…
Many fish purchased and consumed by humans are bred and raised in fish farms. The fish on a farm can be infected by parasites called sea lice, which are small crustaceans that feed on a fish's blood and skin, which may injure or even kill the fish. Jansen and colleagues (2012) analyzed sea lice infections on trout and salmon farms. Fish farms provided data on the numbers of sea lice found on their captive fish. The scientists compared the number of sea lice with the "local farmed fish biomass density," which is a measure of population density that accounts for both the number and biomass (or size) of fish on a farm. Other research has also found a relationship between sea lice infestation and mortality. From this figure and information, how does density of fish on a farm affect the number of sea lice per fish? What type of factor is regulating the size of farmed fish populations and population growth? 100 200 300 400 Local farmed fish biomass density (metric tons) 3. 2. Sea lice counts
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