Which of the following factors exhibits one of the most striking changes as one crosses the ecotone between communities on serpentine and nonserpentine soils in southwestern Oregon?
A) soil depth
B) soil temperature
C) soil chromium
D) soil moisture
Ans: C) soil chromium
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Which bacterium shows a characteristic green sheen when grown on eosin-methylene blue (EMB) agar?
A) Escherichia coli B) Salmonella enterica C) Staphylococcus aureus D) Streptococcus pyogenes
Gymnosperms include plants that demonstrate which of the following characteristics? Select all correct choices
A. flesh-covered seeds B. double fertilization C. pollen-containing cones D. vascular cambia E. photosynthetic stems F. multicellular xylem vessels
Which biological process determines the probability that particular alleles will be found inany given gamete?
A. mutation B. meiosis C. cell cycle D. protein synthesis
All of the following are challenges in gene therapy EXCEPT ________
A) designing a strategy B) unknown cell types C) unknown specific mutations D) inaccessible tissues