Four of the five structures listed below belong to the
same sense. Select the exception.
a. otolith
b. vestibular apparatus
c. semicircular canal
d. cochlea
e. saccule
Answer: d
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How do myelin sheaths increase the speed with which action potentials are propagated along an axon?
A) They increase the permeability of Na+ ions in the plasma membrane. B) They amplify the action potential by increasing sodium influx along the entire distance of the neuron. C) They cause action potentials to "jump" down the axon rather than travel in a continuous path along every site on the axon.
In cancer cells one allele of the tumor suppressor gene p53 is frequently mutated so that the protein is inactive, not produced, or deleted
The other allele will usually have a normal sequence and the promoter remains intact but the gene is not expressed. Sequencing with sodium bisulfite modification of DNA can be used to detect which cytosines are methylated. If the cancer cell DNA is sequenced what would be the anticipated results? A. Cytosines in or near the promoter region will be methylated B. Cytosines in or near the promoter will not be methylated C. Cytosines in the coding region will have an increased mehtylation D. There will be no differences in the methylation pattern of the promoter of p53 from a cancer cell and a normal cell
Two Martians fall in love and marry. One Martian is homozygous for red eyes and the other is
heterozygous. The recessive eye color is purple. What is the probability that they will have a child with purple eyes? a. 1/1 b. 1/2 c. 1/4 d. 3/4 e. 0
You are given a pill in a scientific trial that looks identical to a pill containing an active ingredient, but your pill does not contain an active ingredient. The pill you were given is called a(n):
A) treatment. B) aspirin. C) tablet. D) narcotic. E) placebo.