Zusammenfassung der Ressource
Frage 1
Frage
What do all parasites have in common?
Antworten
-
All parasites live in or on host organisms
-
All parasites kill their hosts
-
All parasites need mosquitoes to move from one host to the next
Frage 2
Frage
What do Gordian worms do to their cricket hosts?
Frage 3
Frage
Suppose you did an experiment in which you gave uninfected rats and rats infected with Toxoplasma a choice between hiding places sprinkled with the urine of cats and rabbits. Which of the following results would you expect to observe?
Antworten
-
Uninfected and infected rats both prefer hiding places with cat urine
-
Uninfected and infected rats both prefer hiding places with rabbit urine
-
Uninfected rats prefer hiding places with rabbit urine, while infected rats prefer hiding places with cat urine
Frage 4
Frage
Dogs infected with rabies virus are aggressive and produce lots of saliva. These symptoms help the virus move on to the next host.
Antworten
-
False; these symptoms help the host get rid of the virus
-
True; the saliva will contaminate the environment, from which other hosts become infected
-
True; these symptoms make the host likely to bite another host and thereby transmit the virus
Frage 5
Frage
How many organisms on Earth are considered parasites?
Antworten
-
One-third
-
More than one-half
-
Nearly all of them