What are the various ways in which toxins can interfere with normal neuron functioning?
What will be an ideal response?
Some toxins bind with receptors on terminal endings of axons, causing continual release of neurotransmitter, while some toxins may block the release of the neurotransmitter. Some toxins block the neurotransmitter's binding site at the target organ, preventing stimulation of the organ. Other toxins may bind to the target's receptor site and cause continual stimulation. Still other toxins may allow normal release and binding of the neurotransmitter but may inhibit the enzyme that normally breaks down the neurotransmitter; the result is prolonged stimulation by the neurotransmitter.
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Second messengers
A. are necessary for all receptor signal transduction mechanisms. B. act in the cell cytoplasm. C. are always proteins. D. always function to activate enzymes. E. only function as intercellular messengers.
The observation that a given enzyme retains its kinetic properties in different species adapted to different temperature regimes is a phenomenon known as
A) Arrhenius effect. B) Q10. C) Conservation of Km. D) Homozyme stability.
Short-chain triglycerides found in foods such as butterfat molecules in milk are split by a specific enzyme in preparation for absorption. Which of the following enzymes is responsible?
A) rennin B) pepsin C) lipase D) cholecystokinin