A modified cell membrane that carries out photosynthesis using bacteriorhodopsin in the absence of chlorophyll is called the ________ membrane.
A. orange
B. green
C. colorless
D. purple
Answer: D
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The moraines left when glaciers retreat are poor soils characterized by
A. cairns that function as bird nests. B. low nitrogen content and little organic matter. C. ice year-round. D. secondary succession. E. high levels of nitrogen, phosphate and carbon.
What is a biome, and what principal factors influence biome types?
What will be an ideal response?
During the 1800's and earlier, most individuals
thought the Earth was approximately
a. 6 billion years old. b. 600 million years old. c. 600,000 years old. d. 60,000 years old. e. 6,000 years old
Eastern and Western meadowlarks look almost identical and sometimes inhabit the same areas of prairies. These birds recognize members of their own species by distinctive songs and thus do not breed with each other. This is an example of
A) temporal isolation. B) ecological isolation. C) behavioral isolation. D) mechanical isolation. E) geographic isolation.