Mobile Genetic Elements and Microbial Hosts

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AccurateTinWhistle
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What can drive the evolution of bacterial hosts towards higher virulence?

Mobile genetic elements (mGes)

Why are mGes maintained within the population effectively by accident?

Via transmission of Wolbachia from one host to the next

How can the acquisition of deleterious mGes be partially rescued in some microbial hosts?

Via compensatory evolution

What can lead to the extensive maintenance of mGes in certain genomes?

<p>Inefficient natural selection</p> Signup and view all the answers

What can happen to mGes in host lineages to become indispensable components of the host genome?

<p>They are passed on to daughter cells</p> Signup and view all the answers

How can mobile genetic elements (MGEs) affect the microorganism–eukaryotic host relationship?

<p>By coding for traits that harm or benefit microbial hosts</p> Signup and view all the answers

What can happen to a resistance-conferring MGE in the absence of the corresponding antibiotic?

<p>It can become costly to its host</p> Signup and view all the answers

What systems force the maintenance of large low-copy-number plasmids in microbial hosts?

<p>Resolution systems, partitioning systems, and post-segregational killing systems</p> Signup and view all the answers

What do toxin-antitoxin systems encode?

<p>Both a stable protein toxin and a less stable antitoxin</p> Signup and view all the answers

How can mobile genetic elements transition from being beneficial elements to parasites over time?

<p>Over very short evolutionary timescales</p> Signup and view all the answers

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