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Acanthocephala: Quiz


Question 1: The most notable feature of the acanthocephala is the presence of an ________, protrudible proboscis that is usually covered with spiny hooks (hence the common name: thorny headed worm).
DigestionAnatomical terms of locationAnatomyEar

Question 2: In their micro-structure the muscular fibres resemble those of ________.

Question 3: Acanthocephalans typically have complex life cycles, involving a number of hosts, including invertebrates, fishes, amphibians, ________, and mammals.
Modern birdsEnantiornithesArchaeopteryxBird

Question 4: The male uses the excretions of its cement glands to plug the ________ of the female, preventing subsequent matings from occurring.
VaginaClitorisPenisFemale ejaculation

Question 5: Infections found in commercial-sized ________ in Canada were probably acquired from crabs that form an important dietary item of lobsters.
LobsterCrayfishHaddockAmerican lobster

Question 6: Phylogenetic analysis of the 18S ________ gene has revealed that the Acanthocephala are most closely related to the rotifers, or may even belong in that phylum.
Cell nucleusMitochondrionRibosomeCell (biology)

Question 7: Acanthocephalans lack a mouth or ________.
Human gastrointestinal tractPeritonitisAscending cholangitisColorectal cancer

Question 8: It is thought that when Gammarus lacustris is infected with a thorny-headed worm, the parasite causes ________ to be massively expressed.

Question 9: Recent ________ analysis has shown that they are descended from, and should be considered as, highly modified rotifers.

Question 10: Traversing the cavity of the proboscis are ________-strands inserted into the tip of the proboscis at one end and into the septum at the other.
FasciaTorsoMuscleHead and neck anatomy

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