The bacterium ends up perched on a “throne”, a stalk protuberance of the gut cell arising from the gut surface. Molecules of what common protein are polymerized into a string of yellow beads to form the fibers that push up the membrane under the bacterium and form this “throne”<\/p>\n\n\n\n
The correct answer and explanation is:<\/strong><\/mark><\/p>\n\n\n\n Correct Answer: Actin<\/strong><\/p>\n\n\n\n Explanation (300 words):<\/strong><\/p>\n\n\n\n The bacterium described is manipulating the host’s cellular machinery to form a “throne” \u2014 a protrusion that elevates it above the surface of the gut cell. This structure is created using actin<\/strong>, a common and crucial protein in eukaryotic cells. Actin is highly conserved and plays a vital role in maintaining cell shape, enabling movement, and facilitating intracellular transport.<\/p>\n\n\n\n In the context of bacterial infection, certain pathogenic bacteria like Salmonella<\/em> and Enteropathogenic E. coli (EPEC)<\/em> are known to hijack the host’s actin cytoskeleton to benefit their own survival and proliferation. These bacteria inject specialized proteins into the host cell through a type III secretion system. These injected proteins trigger the rapid polymerization of actin beneath the site of attachment, pushing the cell membrane upwards and forming pedestal-like structures.<\/p>\n\n\n\n This actin polymerization is visually described as a string of yellow beads<\/strong>, which likely refers to the polymerized actin filaments (F-actin). Individual actin monomers (G-actin) come together in a helical structure to form these long filaments. When enough filaments accumulate and organize beneath the site where the bacterium attaches, they exert an upward force on the membrane, resulting in a visible bump or stalk \u2014 the so-called “throne”.<\/p>\n\n\n\n This mechanism serves the bacterium in several ways:<\/p>\n\n\n\n In summary, the “throne” structure beneath the bacterium is formed by the polymerization of actin<\/strong>, which is repurposed by the bacterium from its usual cellular roles to construct a supportive pedestal beneath itself.<\/p>\n","protected":false},"excerpt":{"rendered":" The bacterium ends up perched on a “throne”, a stalk protuberance of the gut cell arising from the gut surface. Molecules of what common protein are polymerized into a string of yellow beads to form the fibers that push up the membrane under the bacterium and form this “throne” The correct answer and explanation is: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-23916","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/23916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=23916"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/23916\/revisions"}],"predecessor-version":[{"id":23917,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/23916\/revisions\/23917"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=23916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=23916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=23916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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