Which statement is TRUE about Streptococcus pneumoniae and the lung infection it causes?
A) Streptococcus pneumoniae can spread from the focus of infection as a bacteremia.
B) Penicillin and erythromycin are the "last chance" drugs for treatment of streptococcal pneumonia.
C) Infection with any strain of encapsulated virulent Streptococcus pneumoniae provides long-lasting immunity to all encapsulated virulent strains.
D) Streptococcal pneumonia is not as serious as most people think; if left untreated, it usually runs its course in about a week to ten days.
Answer: A
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Which benefit, derived from biodiversity, would be categorized as an ecosystem service?
a. the anticancer drug Taxol, derived from the yew tree b. plants and fruits that are edible by humans c. cotton and other useful plant-derived fibers d. decomposition of wastes e. wild organisms as a source of genes for genetic engineering
Which of the following contribute to the environmental resistance of bacterial endospores?
A. Presence of calcium dipicolinate B. Spore coat C. Low water content of endospore D. Lower pH E. All of the choices are correct.
T cells become immunocompetent where?
a. yellow bone marrow b. red bone marrow c. thymus d. thyroid
Which type of animal is most likely to gain water by osmosis from its environment?
A. freshwater bony fishes B. marine bony fishes C. birds D. reptiles E. cartilaginous fishes