Long-night plants that only flower when they encounter a certain minimum number of hours of darkness are an example of:
A) phototropism. B) photoperiodism. C) geotropism. D) thigmotropism.
Answer: B
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Marine fish will (select all correct choices):
A. lose electrolytes across the skin and gills. B. gain water across the skin and gills. C. gain electrolytes across the skin and gills. D. gain electrolytes from drinking. E. lose water across the skin and gills.
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.
You recently discovered a new element, and find that this particular element has one electron its outer energy level. What would you expect will happen to an atom of this element if placed in water?
A. It will gain an electron forming a positive ion. B. It will lose an electron forming a negative ion. C. It will lose an electron forming a positive ion. D. It will gain an electron forming a negative ion.
The fossil records indicates that ________ lived in families of male-female pairs, used fire, and left evidence of social cooperation (lived communally).
A) Homo habilis B) Australopithecus C) Dryopithecus D) Homo erectus