<span>Pacinian corpuscles are rapidly adapting mechanoreceptors so they respond only at the onset and offset of the stimulus. The Pacinian corpuscle has a single afferent nerve fiber. Its end is covered by a sensitive receptor membrane whose sodium channels will open when the membrane is deformed in any way. Pressure thus causes sodium to enter the neuron and create a generator potential. If this potential reaches a certain threshold nerve impulses are formed. This impulse is now transferred along the axon with the use of sodium channels and sodium/potassium pumps in the axon membrane. The magnitude of the stimulus is encoded in the frequency of impulses generated in the neuron. So the more massive or rapid the deformation of a single corpuscle, the higher the frequency of nerve impulses generated in its neuron.</span>
Answer:
False
Explanation:
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Answer:
Animals communicate from all of the above.
Explanation:
In negative control, Repressor molecule is expected to be bound to the operator is there is no transcription.
Repressor molecule is a small protein which binds with the operator gene and prevents it from starting the synthesis of proteins called operon. The repressor molecule controls the amount of enzyme synthesis by reducing its rate of formation. The lac repressor is a protein that represses (inhibits) transcription of the lac operon. In negative control, repressor molecule binds with the DNA molecule and blocks transcription process. A negative control is an experimental control that does not give a response to the test. The system of regulation in lactose and tryptophan operons outlined above is essentially a negative control.
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