While walking through a nearby park, you stop to admire your favorite stone sculpture, and find that it is covered, in a few places, with green, crust-like organisms. Which statement is true?
a. The green organisms are fungi that will die soon enough, because they cannot digest stone.
b. The green organisms are plants that will die soon enough, because they cannot root in stone.
c. The green organisms are actually lichen that will grow and spread, if the weather permits.
d. The green organisms are colonies of bacteria that feed on certain types of limestone.
c. The green organisms are actually lichen that will grow and spread, if the weather permits.
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Microsporidians are considered parasitic because of the ability to penetrate their host cells using _____
A) a mycelium B) a polar tube C) sporangia D) chitin
Toxicants occurring in aquatic ecosystems are highly subjected to biological magnification, meaning the
A) pollutants take a long time to break down. B) pollutants occur in higher concentrations in tissues of organisms higher up the food chain. C) toxic chemicals specifically target primary producers, disrupting the entire food web. D) chemicals are converted to more toxic compounds once in the water. E) toxic chemicals accumulate in the upper (photic) zones of the water.
A patient presents with severe colitis associated with an overgrowth of Clostridium difficile in the lower bowel. The most likely cause of this condition is
A. botulinum food poisoning B. a stomach ulcer C. a compromised immune system D. antibiotic therapy E. mechanical blockage of the large intestine
In the food chain below, what does the blue jay represent?crabgrass-cricket-garden spider-blue jay-red-tailed hawk
A. secondary carnivore B. herbivore C. detritivore D. primary producer E. primary carnivore