Which organs play a role in mechanical digestion?
A) small intestine
B) liver
C) mouth
D) large intestine
E) stomach
C) mouth
E) stomach
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Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems?
A) Many primary and higher-order consumers are opportunistic feeders. B) Decomposers compete with higher-order consumers for nutrients and energy. C) Nutrient cycles involve both abiotic and biotic components of ecosystems. D) Nutrient cycling rates tend to be limited by decomposition. E) Energy transfer between trophic levels is usually less than 20 percent efficient.
Which one of the following Gram-negative bacteria is least likely to be the cause of a nosocomial infection?
A) a Klebsiella spp. B) a Salmonella spp. C) Escherichia coli D) Pseudomonas aeruginosa
For more serious infections caused by Acinetobacter spp., such as pneumonia or bacteremia, effective treatment may require the use of:
a. multiple rounds of penicillin or a similar antibiotic. b. a <-lactam agent in combination with an aminoglycoside antibiotic. c. repeated high-level doses of gentamycin. d. single-drug therapy in combination with a steroid.
Heterozygotes for the sickle cell trait have an adaptive advantage in areas where malaria is prevalent. This is an
example of ____.
a. a fixed allele b. genetic drift c. a balanced polymorphism d. sexual selection e. disruptive selection