Which one of the following marine ecosystems would be expected to have the lowest species diversity and primary production per unit area?
A. oligotrophic oceans
B. upwelling regions of ocean
C. coral reefs
D. estuaries
E. intertidal zone
A. oligotrophic oceans
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The process often referred to as "cellular eating" is
A. osmosis. B. pinocytosis. C. phagocytosis. D. diffusion. E. active transport.
True or false: mutations always result in the death of the organism which acquires them
A. true B. false
Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?
A. TSEs include scrapie in sheep, mad cow disease, chronic wasting disease in deer and elk, and kuru and variant Creutzfeldt-Jakob disease in humans. B. The incidence of Creutzfeldt-Jakob disease in humans increased after an outbreak of mad cow disease in England, suggesting that mad cow disease may be transmitted to humans. C. Viroids are the likely cause of TSEs. D. TSEs do not seem to be affected by treatments that would eliminate nucleic acid-based diseases. E. Infectious TSE preparations do not seem to contain DNA or RNA.
Which of these describes a genetically modified organism?
A) an organism that divides asexually B) an organism that can mate with any other species because of DNA technology C) an organism that has been genetically altered for agricultural applications D) an organism that has at least one gene from another species inserted into its DNA E) corn that no longer resembles ancestral corn due to many generations of selective breeding