Each upward movement of the basilar membrane causes the stereocilia of the inner hair cells to bend, opening K+ gates.
The area of the brain that was most likely stimulated is the motor cortex portion of the frontal lobe.
The frontal lobe plays a large role in movement because the primary motor cortex which regulates movement activities is located in it. Stimulation of the monkey motor cortex can evoke complex actions.
In the absence of tryptophan, the genes trpA-E will not be transcribed.
If there were a mutation in the operator region of the trp operon, there would be a nucleotide change in the sequence of the operator. Mutations in the repressor that prevent its binding to the operator will lead to constitutive expression Mutations that prevent binding of the inducer without affecting the ability to bind to the operator lead to a non‑inducible phenotype.
The tryptophan binds to the trp repressor and causes it to change shape, converting into its active form. The trp repressor with the bound tryptophan attaches to the operator, blocking RNA polymerase from binding to the promoter and preventing transcription of the operon.
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Fertile land is lost, and there is increased pollution and sedimentation in rivers and other aquatic areas.
