The most common chronic blood-borne infection in the U.S. is
A. hepatitis A
B. hepatitis B
C. hepatitis C
D. hepatitis D
C
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Which statement best summarizes the results of the experiment by Damschen and her colleagues on the effect of
landscape corridors on species richness?
a. Habitat patches with landscape corridors are at higher risk of encroachment by exotic species than are isolated habitat patches. b. Over time, the number of native species harbored by habitat patches with landscape corridors was increasingly greater than in isolated habitat patches. c. The number of both native and exotic species increased over time in habitat patches that were connected by landscape corridors. d. The number of native species increased over time in isolated habitat patches but not in those connected by corridors. e. The number of exotic and native species decreased in patches connected by landscape corridors.
The demographic transition is typically seen
a. when a country moves from an industrial phase into a more agricultural phase. b. as developed countries use more resources. c. when agriculture becomes more efficient. d. when epidemics lead to high death rates. e. as a country moves toward a more industrial phase.
Meiosis may pause at which point in the cycle?
a. after DNA is replicated in S phase but before meiosis I begins b. after meiosis I is complete c. after prophase II d. before telophase II e. after prophase I
In the 1960s and 1970s, organisms were classified into five kingdoms, one of which was prokaryotes
In the 1980s, organisms were reorganized into three domains, with the prokaryotes split into Archaea and Bacteria, and all of the other four kingdoms lumped together into Eukarya. Why did this happen?