Pathogens and Virulence Evolution
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Questions and Answers

According to the passage, why do pathogens tend to mellow as they age?

  • To settle into being unremarkable childhood illnesses.
  • To quickly destroy their victims for survival.
  • To avoid rapidly destroying their victims and ensure long-term survival. (correct)
  • To trigger the survivors to move on to new hosts.

Which pathogens are mentioned as examples of initially being reckless killers but later becoming unremarkable childhood illnesses?

  • Measles and smallpox (correct)
  • Cholera and typhoid
  • Malaria and smallpox
  • Measles and malaria

What characteristic of malaria is highlighted in the passage as compared to measles and smallpox?

  • Malaria's continuing malevolence and tenacity (correct)
  • Malaria's ability to adapt quickly to new environments
  • Malaria's rapid spread amongst populations
  • Malaria's preference for urban areas

Why did smallpox and measles stop taking millions of lives as time passed according to the passage?

<p>The pathogens encountered virgin populations. (D)</p> Signup and view all the answers

What historical event is mentioned in relation to smallpox and measles affecting virgin populations?

<p>The conquest of the New World in the 15th century (B)</p> Signup and view all the answers

How does the passage suggest humans have adapted to malaria over evolutionary history?

<p>By developing immunity to malaria through past exposure. (D)</p> Signup and view all the answers

What makes malaria a ferocious disease, according to the text?

<p>The fact that it is caused by a cheater parasite that depletes others of their livelihood. (C)</p> Signup and view all the answers

What differentiates parasites like Plasmodium from other organisms mentioned in the text?

<p>They eke out their livelihood by depleting others of theirs. (D)</p> Signup and view all the answers

Why did Henry Drummond consider parasitism a 'breach of the law of Evolution'?

<p>Because parasites hinder the natural progression of evolution by exploiting other organisms for survival. (C)</p> Signup and view all the answers

What is highlighted as a unique characteristic of Plasmodium's ancestors before they became parasites?

<p>They contained vestiges of photosynthesis machinery from their plantlike origins. (D)</p> Signup and view all the answers

What sets Plasmodium apart from other described species practicing the parasitic lifestyle?

<p>The fact that it arose as a response to new opportunities rather than being hardwired for parasitism. (B)</p> Signup and view all the answers

How does malaria affect human beings, based on the information provided in the text?

<p>It infects one out of twenty-one human beings globally and leads to a high number of deaths every year. (C)</p> Signup and view all the answers

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