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Question
Biology
Posted 4 months ago

Cone snails are among the most venomous animals on the planet and their venom contains many different toxins to neutralize their prey. As a researcher, you've isolated a peptide from the venom of the Conus geographus and discovered that it binds to voltage - gated sodium channels and locks them in the 'open' state (all other channels and pumps work normally). What effect will this have on the prey and why (explain your reasoning)?
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Answer from Sia
Posted 4 months ago
Answer
The prey will likely experience paralysis and potentially death.
Solution
a
Voltage-gated sodium channels are essential for action potential initiation and propagation in neurons and muscle cells
b
Locking these channels in the 'open' state will cause a prolonged influx of sodium ions (Na⁺) into the cells
c
This sustained depolarization will prevent the neurons from repolarizing, making them unable to fire subsequent action potentials
d
Muscle cells will also be unable to repolarize, leading to continuous contraction or paralysis
e
The inability of neurons to communicate effectively and the paralysis of muscles, including those required for respiration, can be fatal for the prey
Key Concept
Voltage-gated sodium channels and action potential propagation
Explanation
The peptide from Conus geographus venom locks voltage-gated sodium channels in the 'open' state, causing sustained depolarization, which leads to paralysis and can be fatal due to the disruption of neural signaling and muscle contraction.

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