In which of the following regions has human conversion of natural ecosystems to other uses resulted in severe erosion of soil by wind or water?
A) prairies of North America
B) forests of the Amazon Basin
C) forests of Queensland, Australia
D) all of the above
Ans: D) all of the above
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Which dissolved gas cannot be transported by hemoglobin?
A. oxygen (O2) B. nitrogen (N2) C. nitric acid (NO) D. carbon monoxide (CO) E. carbon dioxide (CO2)
When one muscle group is stimulated, no nervous signals are sent to the opposing group. This is the
result of a. reciprocal innervation. b. lack of innervation. c. hyperreflexia. d. compensation. e. depolarization.
Translational controls regulate:a
the activity of a protein end-product that is produced. b. the rate at which an mRNA molecule is translated. c. the rate at which an mRNA molecule is synthesized. d. the uptake of nucleic acids into the cell. e. the attachment of phosphate groups to polypeptides
Which of the following laboratory procedures is used for culturing animal viruses in the laboratory?
A) cell cultures B) broth cultures C) embryonated eggs D) both cell cultures and embryonated eggs E) synthetic cytoplasm