Epidemic typhus, spread by lice, is caused by
A) Chlamydophila pneumonia.
B) Chlamydophila psittaci.
C) Ehrlichia caffeensis.
D) Rickettsia prowazekii.
E) Rickettsia typhi.
D
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A group is considered polyphyletic if
A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. all members share homoplastic traits. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
Steroid and thyroid hormones do not bind to membrane surface receptors because they ____
a. are small enough to pass directly through the membrane b. are soluble in the lipid bilayer c. pass through special membrane channels d. are water-soluble e. dissolve in the cholesterol present in cell membranes
Which vessel type regulates the amount of blood a particular area receives?
a. arteries b. arterioles c. capillaries d. venules e. veins
What is the cause of Huntington disease?
A) a mutation that results in defective amino acid synthesis B) a mutation that results in defective DNA polymerase C) a somatic cell mutation that causes cells to proliferate without control D) a mutation in which there are repeating groups of three nucleotides E) loss of the chromosome with the gene for a blood protein