Which key symptoms listed below can be used to distinguish between plants deficient in phosphorous vs. nitrogen (which symptom(s) is only associated with one of the deficiencies)?
A) the plants are stunted.
B) the plants show symptoms on older leaves first.
C) the plants are darker green and show evidence of wide spread purple anthocyanin pigmentation, especially in the veins.
D) the plants show symptoms on younger leaves first.
Answer: C) the plants are darker green and show evidence of wide spread purple anthocyanin pigmentation, especially in the veins.
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Most carnivorous plants use their prey as a source of
A. carbon. B. magnesium. C. nitrogen. D. potassium. E. hydrogen.
Plate tectonic theory is based on
a. a thermal convection model in which cool material in the earth’s mantle rises and spreads laterally beneath the crustal plates. b. the idea that the earth’s crust is fragmented into rigid crusts that are sinking slowly beneath crustal plates. c. the idea that coacervate formation causes continents to drift apart slowly on their crustal plates. d. observations that the sea floor is slowly spreading away from oceanic ridges due to thermal convection in the mantle. e. all of these.
Most representatives of the phylum Porifera gain nutrition as:
A. parasites. B. predators. C. autotrophs. D. herbivores. E. suspension feeders
Amino acids are delivered in their appropriate order by
A) mRNAs. B) RNA-induced silencing complexes (RISC). C) ribozymes. D) rRNAs. E) tRNAs.