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Bacteria

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Bacteria exhibit a wide range of shapes across different species. Even small changes in size can significantly impact energy costs. For instance, in motile bacteria, alterations as minute as nanometer-scale diameter changes can increase the energy required for chemotaxis. As a result, bacterial morphology is subject to purifying selection, allowing adaptation to specific microenvironments.
Mitchell 2002 Am Nat 160: 727-740
Young 2007 Curr Opin Microbiol 10: 596-600
Kysela et al. 2016 PLoS Biol 14: e1002565