In the second half of the twentieth century, human activities have more than tripled the amount of
nitrogen released from land into the atmosphere or aquatic systems.
Indicate whether the statement is true or false.
ANS: F, doubled
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Which of the main taste types for which we have receptors is important for detecting possible toxic substances?
A. salty B. sweet C. sour D. bitter E. salty and sweet
Which of the following is a true statement regarding lysogeny?
A. It halts the viral life cycle because the phage genes are no longer replicated. B. The host bacterial cell is lysed once the phage genome is integrated. C. The host bacterial cell acquires new characteristics that are often detrimental to humans. D. Once the phage genome is integrated into the host cell, it remains there permanently.
Early treatment for mushroom poisoning includes
A) antitoxin therapy. B) antifungal therapy. C) ingestion of activated charcoal. D) kidney dialysis. E) rehydration therapy.
All the following are events of early inflammation, except
A. exudate and pus can accumulate. B. brief vasoconstriction is followed by vasodilation. C. macrophages appear first and begin phagocytosis. D. chemical mediators and cytokines are released. E. capillaries become more permeable resulting in edema.