Which one of the following actions of humans has not contributed to the worldwide reduction in biodiversity?
A) pollution
B) growth of cities
C) logging
D) clear-cutting of rain forests
E) biomass energy sources
E
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Which element is considered a macronutrient needed by plants?
a. manganese b. iron c. copper d. potassium e. boron
A local bronchodilation within the alveolus will result in a(n) ________ in the ventilation-perfusion ratio in that region. A vasoconstriction of pulmonary arteriole diameter will result in a(n) ________ in the ventilation-perfusion ratio in that region.
A) lack of change : increase B) increase : increase C) increase : decrease D) decrease : increase E) decrease : decrease
The Ames test ________.
A. is used to measure levels of oxygen-free radicals B. can be used to measure the mutagenicity of chemicals C. is used to measure the repair of thymine dimers D. None of the choices are correct.
All of the following are acquired by ingestion EXCEPT
A) botulism. B) cryptococcosis. C) listeriosis. D) poliomyelitis. E) Creutzfeldt-Jakob disease.