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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?

The pathogens encountered virgin populations. Signup and view all the answers

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

The conquest of the New World in the 15th century Signup and view all the answers

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

By developing immunity to malaria through past exposure. Signup and view all the answers

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

The fact that it is caused by a cheater parasite that depletes others of their livelihood. Signup and view all the answers

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

They eke out their livelihood by depleting others of theirs. Signup and view all the answers

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

Because parasites hinder the natural progression of evolution by exploiting other organisms for survival. Signup and view all the answers

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

They contained vestiges of photosynthesis machinery from their plantlike origins. Signup and view all the answers

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

The fact that it arose as a response to new opportunities rather than being hardwired for parasitism. Signup and view all the answers

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

It infects one out of twenty-one human beings globally and leads to a high number of deaths every year. Signup and view all the answers