Which one of the following ions outside the neuron would make it very difficult for a depolarization to occur?
A) chloride B) potassium C) sodium D) manganese
Answer: A
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Which mechanoreceptor(s) responds to vibrations?
a. free nerve endings only b. Pacinian corpuscle only c. Ruffini endings only d. free nerve endings and Meissner's corpuscle e. Pacinian corpuscle and Ruffini endings
Which of these structures forms the channel that sound travels through to reach the eardrum?
A) auditory tube B) external auditory canal C) malleus D) incus
Which of the following is a source of vitamin K for humans?
A) Bacteroides thetaiotetraiotamicron digests foods, which release vitamin K. B) Escherichia coli in their digestive tract produces vitamin K. C) S. epidermidis releases vitamin K from dead cells. D) their diet only
Comparison of the mouse and human genomes show that overall about 5% of nucleotides have evidence of selection acting on them, as compared to 1% of sites within exons. This suggests that
a. the mouse genome evolves more quickly than the human genome. b. most changes in exons are eliminated. c. the mouse genome is more subject to neutral evolution than the human genome. d. the mouse genome evolves more slowly than the human genome. e. many sequences that do not encode polypeptide are functionally important.