Trichloroethylene (TCE) is toxic to humans because it
A. depletes nitrogen from soils.
B. is carcinogenic.
C. contains heavy metals.
D. prevents CO2 production by plants.
E. causes a decrease in the yield of crop plants.
B. is carcinogenic.
TCE or trichoroethylene is a chemical that has many commercial uses. TCE is a confirmed carcinogen and prolonged exposure can damage the liver.
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When nucleotides polymerize to form a nucleic acid _____
A) a covalent bond forms between the sugar of one nucleotide and the phosphate of a second B) a hydrogen bond forms between the sugar of one nucleotide and the phosphate of a second C) covalent bonds form between the bases of two nucleotides D) hydrogen bonds form between the bases of two nucleotides
Two different nucleic acids can ________ by annealing at their complementary sites.
A. covalently bond B. hybridize C. ligate D. form a peptide bond
Which model would predict that populations diverge from one another through the slow accumulation of adaptive
changes within each population? a. punctuated equilibrium b. paedomorphosis c. hybridization d. allopolyploidy e. gradualism
Lichens are adversely affected by
A. sexual reproduction of the fungal partner. B. asexual reproduction of the photosynthetic partner. C. sunlight. D. pollution. E. humidity.