For a phylogenetic tree relating four species:
a. there is only one possible basic tree shape.
b. there are three possible basic tree shapes.
c. four different unrooted tree arrangements are possible.
d. seven different unrooted tree arrangements are possible.
A
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The largest unit within which gene flow can readily occur is _____
A) a population B) a species C) the entire range of a genus D) the hybrid zone E) the entire range of a phylum
DiGeorge's syndrome is a developmental defect that prevents the maturation of the thymus. What cell type would be reduced by this condition?
A) T cells B) B cells C) macrophages D) lymphocytes
In order to speed up the sterilization process, which of the following would be useful?
A. Drying the material B. Washing/mechanical removal of bacteria/organic matter C. Addition of organics D. Nothing E. Washing/mechanical removal of bacteria/organic matter AND addition of organics
A severe, life-threatening systemic Type 1 allergic response, occurring most often due to an injected antigen, is known as ________.
A) Autoimmunity B) Atopy C) Hemolytic disease D) Anaphylaxis