The reason coral reefs are among the most productive and successful ecosystems is due to
A. commensalisms.
B. the lichen mutualistic relationship.
C. the coral-dinoflagellate mutualistic relationship.
D. All of the choices are correct.
Answer: C
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Which of the bone development lineages is incorrect?
A. white blood cell progenitors ? monocytes ? osteoclast B. undifferentiated mesenchymal cells ? osteocyte ? osteoblast C. undifferentiated mesenchymal cells ? fibroblast ? collagen D. undifferentiated mesenchymal cells ? chondroblast ? chondrocyte E. undifferentiated mesenchymal cells ? osteoblast ? osteocyte
Carbon can be returned to the atmosphere by all of the following except:a
animal respiration. b. photosynthesis. c. combustion. d. plant respiration. e. decomposition.
All of the following are correct about the indirect ELISA, except
A.) it can detect antibodies in a serum sample. B.) it is the common screening test for antibodies to Helicobacter. C.) color development indicates that antibody was not present in the patient's serum. D.) it is the common screening test for antibodies to Hepatitis A. E.) a known antigen is adsorbed to the surface of a well.
A marine biologist wishes to test the hypothesis that heavy grazing by snails causes the alga Ulva to stay short rather than grow upright. Which of the following variables could be manipulated successfully at the seashore to test this hypothesis?
A) Add nutrients to the nearby ocean waters to see if the algae grow taller B) Put a small cage around the algae to keep snails from eating them and then see if the protected algae are taller than unprotected ones C) Change the light intensity to see if this causes the algae to stay short D) Redirect ocean waves to see if wave shock causes the algae to stay short