Which of the following statements regarding the phosphorus cycle is incorrect?
A. The phosphorus pool is in sedimentary rock.
B. Phosphorus must be phosphatized to enter biological systems.
C. Phosphorus is released naturally by mining.
D. Phosphorus mineralization occurs by microbial action.
E. Thiobacillus produces sulfuric acid that dissolves phosphate rock.
Answer: C
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The following are four processes common to most cloning experiments:
i) transforming bacteria ii) plating bacteria on selective medium iii) cutting DNA with restriction endonucleases iv) ligating DNA fragments Place the components of this list in the order in which they would most likely occur during a cloning experiment. A) ii, iii, i, iv B) iii, iv, i, ii C) iv, i, iii, ii D) ii, i, iv, iii E) i, ii, iii, iv
Four of the five answers are edible mycorrhizal fungi. Select the exception
a. chanterelles b. truffles c. shiitake mushrooms d. porcini mushrooms e. morels
The theory that a severe drought was responsible for
the disappearance of the Jamestown colony and the hardships of the Virginia colony came from evidence a. that showed corn from plants grown during that time. b. that showed the trees completely lacked growth rings. c. that showed Cypress trees from both colonies experienced low growth. d. from witnesses from both colonies. e. none of these.
The term that refers to the accumulation of toxins in a food chain is ____
a. biological amplification b. toxin accumulation c. biological magnification d. chemical amplification e. chemical magnification