Which combination is an example of prezygotic mechanisms of isolation?
a. hybrid breakdown and temporal isolation
b. hybrid breakdown and gametic isolation
c. hybrid sterility and temporal isolation
d. mechanical and temporal isolation
e. mechanical and hybrid breakdown
ANSWER: d
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This hemorrhagic fever causes disease in humans and nonhuman primates such as chimpanzees, gorillas, and monkeys. It is identified in the laboratory using which type of assay?
a. Immunodiffusion b. Peptide nucleic acid fluorescence in situ hybridization (PNA-FISH) c. Transcription-mediated amplification (TMA) d. Reverse-transcriptase polymerase chain reaction (PCR)
Which of these statements is true of interferons?
A) All of these statements are true of interferons. B) Alpha and beta interferons are proteins. C) Alpha and beta interferons do not protect the infected cell; they are secreted by the infected cell and give protection to neighboring cells. D) Alpha and beta interferons are produced by viral infected cells.
Ornithologists visiting an island find two species of birds that appear nearly identical except for bill size. Which of the following is the most likely explanation for their discovery?
A) The birds need camouflage for protection from predators. B) Coevolution of the two species has resulted in resource partitioning between the species. C) They are not separate species. D) There is natural random variability. E) Mutations have resulted in an inferior species with defective bills.
The political reform movement that arose among farmers in the late 1800s was the:
A) global justice movement. B) socialistic movement. C) populist movement. D) progressive movement.