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Cnidocyte: Quiz


Question 1: A cnidocyte fires a structure that contains the toxin, from a characteristic sub-cellular ________ called a cnidocyst (also known as a cnida or nematocyst).
Cell (biology)Cell nucleusMitochondrionOrganelle

Question 2: The most deadly cnidocytes (to humans, at least) are found on the body of a ________.
CnidariaCtenophoraBryozoaBox jellyfish

Question 3: Despite being morphologically simple — lacking a skeleton and usually being sessile — cnidarians prey on fish and ________.

Question 4: Venom from animals such as cnidarians, ________ and spiders may be species-specific.

Question 5: Animals in the phylum ________ ("sea-gooseberries" or "comb jellies") are transparent and jelly-like but have no nematocysts, and are harmless to humans.

Question 6: The nematocyst capsule stores a large concentration of ________ ions, which are released from the capsule into the cytoplasm of the cnidocyte when the trigger is activated.

Question 7: This discharge takes no more than a few microseconds, and is able to reach ________ of about 40,000 Gs[1].
KinematicsSpeedAccelerationEuclidean vector

Question 8: The supporting cells contain chemoreceptors, which, together with the ________ on the cnidocyte (cnidocil), allow only the right combination of stimuli to cause discharge, such as prey swimming, and chemicals found in prey cuticle or skin.
MechanoreceptorPainNervous systemNociceptor

Question 9: A single nematocyst has been shown to suffice to paralyze a small arthropod (________ larva).
Drosophila melanogasterModel organismDrosophilaMaize

Question 10: A cnidocyte, cnidoblast, or nematocyte is a type of venomous cell unique to the phylum ________ (corals, sea anemones, hydrae, jellyfish, etc.).


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