Two human activities, burning fossil fuels and ________, are important causes of the increase in atmospheric carbon dioxide
Fill in the blank(s) with correct word
deforestation
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A change in the rate or frequency of movements in response to environmental stimuli is called taxis
a. True b. False
Nitrogen fixation and nitrification are directly important processes for:
a. heterotrophic animals. b. heterotrophic bacteria. c. autotrophic organisms. d. fungi. e. viruses.
Compare and contrast the nuclear envelope and the plasma membrane.
a. The nuclear envelope consists of two concentric phospholipid bilayers while the plasma membrane is only one phospholipid bilayer. Both membranes are selectively permeable and have pores. b. The nuclear envelope consists of two concentric phospholipid bilayers while the plasma membrane is only one phospholipid bilayer. Neither membrane is selectively permeable or has pores. c. Both membranes consist of two concentric phospholipid bilayers, are selectively permeable, and have pores. d. Both membranes consist of two concentric phospholipid bilayers and neither is selectively permeable or has pores.
How many genes did researchers think the human genome contained? How many did it contain?
A. 80,000; 23,000 B. 25,000; 80,000 C. 3 billion; 80,000 D. 1 million; 1 million E. 125 million; 1 million