Which of the following is a biofilm?
a. dental plaque
b. a bacterial capsule
c. elongated pili
d. an oil slick
e. none of these are examples of biofilms
A
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Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the ?-globin gene?
A. silent B. missense C. nonsense D. frameshift E. sense
Scientists may compare similarities between nucleotide sequences of organisms to determine their
evolutionary history. This is known as: a. synapomorphy. b. molecular systematics. c. monophyletic grouping. d. cladistics. e. phenetics
A large stand of aspen trees may be a group of genetically identical individuals produced by vegetative reproduction. Such a collection of individuals is called a
A. Family B. hybrid C. Clone D. genus E. Community
What are the results of the release of cAMP from Dictyostelium discoideum?
A. The cells aggregate, forming a large motile multicellular slug that serves as a precursor to the development of a fruiting body. B. The cells form cysts until the growing conditions improve. C. The cells develop flagella. D. The larger cells cannibalize the smaller, less developed cells.