The kingdom Protista is
A. not considered a valid phylogenetic unit.
B. composed of organisms that are very similar to one another.
C. only contains single-celled organisms.
D. not ecologically important.
A. not considered a valid phylogenetic unit.
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What sensory organ is used to detect electrical currents in the water?
a. Lateral line b. Ampullae of Lorenzini c. Neuromasts d. Maculae
Which of the following groups would be placed nearest the fungi in a phylogenetic tree based on DNA sequences?
a. cyanobacteria b. animals c. amoeba d. gymnosperms e. green algae
In terms of personal health, why should vegetarians still care about the misuse of antibiotics in livestock?
A) Food is often cross contaminated but it's better to have an easily treatable GI infection compared to an antibiotic resistant GI infection. B) Livestock live happier lives without constantly eating antibiotics. C) Recreational water activities become a source of infection when manure-contaminated runoff finds its way into these areas. D) Manure-contaminated water and manure-based fertilizers introduce resistant bacteria into the food chain. E) Manure-contaminated runoff is destroying aquatic life when this runoff gets into local waterways.
In a continuous culture system, the rate at which media is added and removed is called the ________ rate.
A. dilution B. pass-through C. flow-through D. chemostatic