Which of the following is an example of bioremediation?
a. The culturing of milk products, like yogurt
b. The emergence of antibiotic-resistant MRSA
c. The removal of petroleum products in an oil spill
d. The development of antibiotics to fight pathogenic prokaryotes such as Yersenia pestis
c. The removal of petroleum products in an oil spill
Bioremediation is the use of prokaryotes to remove harmful materials from the environment, such as petroleum products in an oil spill or toxic chemicals like mercury and selenium from water supplies.
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If the flow of energy in an arctic ecosystem goes through a simple food chain, perhaps involving humans, starting from phytoplankton to zooplankton to fish to seals to polar bears, then which of the following could be true?
A) Polar bears can provide more food for humans than seals can. B) The total biomass of the fish is lower than that of the seals. C) Seal meat probably contains the lowest concentrations of fat-soluble toxins. D) Seal populations are larger than fish populations. E) Fish can potentially provide more food for humans than seal meat.
The contribution an individual makes to the gene pool of the next generation compared to the contributions of other
individuals is called ____.
a. competition b. genetic drift c. relative fitness d. gene flow e. mutation
Trees with needle-shaped leaves and a thick cuticle with stomata sunk below the leaf surface dominate ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is in the correct order in the formation of antibodies?
A. antigen binds to BCR; B cell activated; B cell divides; plasma cells form B. plasma cells form; B cell divides; B cell activated; antigen binds to BCR C. B cell activated; antigen binds to BCR; B cell divides; plasma cells form D. antigen binds to BCR; B cell divides; B cell activated; plasma cells form E. plasma cells form; B cell activated; B cell divides; antigen binds to BCR