Multiple Choice
Which part of the nucleus is responsible for assembling ribosomes and ribosomal RNA?
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8. Eukaryotic Cell Structures & Functions
Endomembrane System: Protein Secretion
2:10 minutesProblem 10
Textbook Question
Which of the following neurotoxins are released by some species of dinoflagellates to protect themselves from predators?
a) Tetrodotoxin
b) Botulinum toxin
c) Maitotoxin
d) Ricin
Verified step by step guidance1
Step 1: Understand the context of the question, which asks about neurotoxins released by dinoflagellates. Dinoflagellates are a group of marine plankton known for producing various toxins as a defense mechanism.
Step 2: Review each toxin option and its source: Tetrodotoxin is commonly found in pufferfish and some amphibians; Botulinum toxin is produced by the bacterium Clostridium botulinum; Maitotoxin is a potent toxin produced by certain dinoflagellates; Ricin is a plant toxin derived from castor beans.
Step 3: Identify which toxin is specifically associated with dinoflagellates. Since maitotoxin is known to be produced by some species of dinoflagellates, it fits the description in the question.
Step 4: Confirm that the other toxins do not originate from dinoflagellates, reinforcing that maitotoxin is the correct choice.
Step 5: Conclude that the neurotoxin released by some species of dinoflagellates to protect themselves from predators is maitotoxin.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dinoflagellates and Their Ecological Role
Dinoflagellates are a group of single-celled marine plankton, some of which produce toxins as a defense mechanism against predators. These toxins can accumulate in marine food webs, sometimes causing harmful algal blooms known as red tides.
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Neurotoxins Produced by Marine Organisms
Certain marine organisms, including some dinoflagellates, produce potent neurotoxins that affect nerve function. These toxins can block nerve signals or disrupt ion channels, leading to paralysis or other neurological effects in predators or humans.
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Maitotoxin as a Dinoflagellate Neurotoxin
Maitotoxin is a highly potent neurotoxin produced by some species of dinoflagellates, such as Gambierdiscus toxicus. It acts by increasing calcium ion influx in cells, disrupting cellular function and serving as a chemical defense against predation.
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