Chapter 3 Self-test questions

. What makes parasites different from bacteria and viruses?

Many of them are visible to the naked eye.

All of them are visible to the naked eye.

Many of them are visible when using a Gram stain.

None of them are visible when using a Gram stain.

. What are the three groups of parasitic helminths?

Protozoa, trematodes, and cestodes.

Nematodes, trematodes, and schistosomes.

Nematodes, trematodes, and cestodes.

Protozoa, trematodes, and schistosomes.

. What is a definitive host?

A host in which a parasite can grow as big as possible.

A host in which a parasite cannot live at all.

A host in which the parasite can complete its lifecycle.

A host which provides enough nutrients for the parasite.

. What effect are Helminthic parasites thought to have on the immune systems of their hosts?

They destroy their hosts' immune systems.

They can dampen down the aggressiveness of their host's immune system.

They make their hosts' immune systems more effective at fighting infection.

They make their hosts' immune systems more sensitive.

. What is an ectoparasite?

A parasite that lives away from its host for long periods of time.

A parasite with a hard exoskeleton.

A parasite that does not require a host to survive.

A parasite that lives on the outside of its host.

. How do prions differ from bacteria, viruses, fungi, and parasites?

They are made up of a single mis-folded protein.

They can reproduce without a host cell.

They can cross species barriers easily.

They do not cause any symptoms.

. What generic name is given to the substances used to grow pathogens in a lab environment?

Stain plates.

Agar jelly.

Culture media.

Growth medium.

. Why is it impossible to grow many parasites under laboratory conditions?

They are too dangerous to grow in a laboratory.

They cannot survive without their hosts.

Their needs are too complex for laboratory conditions.

It is too expensive to culture them.

. What does PCR stand for?

Polymerase chain reaction.

Polymerase chain reproduction.

Partial chain reproduction.

Partial cell reproduction.

. What does the term biosecurity mean?

A set of rules for preventing diseases from infecting the public.

A set of rules to help pathogens grow more efficiently in a laboratory environment.

A set of rules for scientists to follow to ensure that pathogens are cultured the same way worldwide.

A set of rules to keep scientists and the general public safe when handling pathogens in a laboratory.

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