An ecosystem is a community of ____ producers and ____ consumers that interact with one another and with their nonliving environment
a. energy-consuming; energy-producing
b. primary; secondary
c. autotrophic; heterotrophic
d. heterotrophic; autotrophic
e. nutrient cycling; heat producing
c
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Optimal protection of specimen, personnel, and environment is accomplished with which class of biological safety cabinet?
a. Class I b. Class II c. Class III d. Class IV
One line of evidence for endosymbiosis is that chloroplasts resemble ____
a. anaerobic bacteria b. aerobic bacteria c. fungi d. protists e. cyanobacteria
Precipitation tests involve all of the following, except
A.) they rely on formation of visible clumps for detection B.) they include the VDRL test for syphilis C.) they are often performed in agar gels D.) they can be done in a test tube by carefully adding antiserum over antigen solution E.) a cloudy or opaque zone developing where antigen and antibody react
You live at the base of a mountain where there is a tropical forest. As you travel up the mountain you would expect
A. the kinds of plants and animals to be similar at the base and top of the mountain. B. the forest will change into a grassland. C. to see organisms similar to those found in more northerly climates. D. to find desert.