If the cilia on Bob's inner ear hair cells are damaged, what can be done to improve Bob’s hearing, other than a hearing aid?
Hair cells are delicate sensors of sound, movement, and gravity. Since they are stimulated by movement of the stereocilia and kinocilium, these structures are vulnerable to damage when stimulus is too strong or sustained.
A. transgenic expression of a cilia protein
B. minoxidil treatment
C. injection of microtubules into the cochlea
D. not much – there is currently no drug that can regenerate hair cells
D. not much – there is currently no drug that can regenerate hair cells
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The grouping or classification of species is termed
A. eukaryotism. B. prokaryotism. C. genus. D. kingdom. E. taxonomy.
In roots auxins tend to ________ cell elongation, in stems they promote cell elongation.
A. promote B. not influence C. have little effect on D. not be a factor in E. inhibit
The incubation period of rabies is partially determined by
A. age of the patient. B. season of the year that the disease is acquired. C. length of journey from the bite site to the brain. D. the amount of virus introduced into the wound. E. length of journey from the bite site to the brain AND the amount of virus introduced into the wound.
For a skeletal muscle to contract, all of the following must occur EXCEPT ______.
a. calcium levels must increase in close proximity to contractile proteins. b. a drop in calcium levels also stimulates contraction. c. once the stimulation by a nerve ceases, skeletal muscle can no longer contract. d. a nerve impulse is required to initiate contraction. e. All of these are correct.