Which of the following is a thin-walled, rounded chamber surrounded by a vast network of capillaries?
A) surfactant
B) alveolus
C) diaphragm
D) glottis
B
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Which one of the following statements about endosymbiosis and the origin of the eukaryotic cell is FALSE?
A. Mitochondria are the descendants of purple bacteria. B. The chloroplasts of red and green algae are the descendants of cyanobacteria. C. Algae incorporated prokaryotic cells that became chloroplasts, but never acquired mitochondria. D. Many compartments of the eukaryotic cell are derived from the endomembrane system. E. Ultimately, both the chloroplast and the mitochondria of eukaryotes are descendants of prokaryotic cells.
Acridine dyes are mutagens that
A) disrupt the reading frame of the gene. B) replace an AT base pair with a GC base pair. C) reverse the polarity of the double helix. D) kill cells.
One group of fruit flies reproduces in August and one group reproduces in September. Which of the following
mechanisms is preventing them from cross breeding? a. sexual isolation b. diurnal isolation c. gametic isolation d. temporal isolation e. mechanical isolation
Remote oceanic islands are characterized as having disharmonic biota, meaning the number and relative proportions of taxa living on the island differ significantly from the number and relative proportions of taxa on the nearest continental mainland
area. Each island system is disharmonic in its own unique way. Why?