What country contains the highest concentration of endangered animals?
A. Mexico
B. United States of America
C. Costa Rica
D. Trinidad and Tobago
E. Tanzania
Answer: E
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Toxic landfills are frequently located in ________ areas.
A. Suburban B. Nonpopulated C. Urban D. Rural E. Wilderness
Which of the following is true of trypsin?
A) It does not affect any peptide bonds. B) It hydrolyzes all peptide bonds. C) It hydrolyzes peptide bonds to leucine and phenylalanine. D) It hydrolyzes peptide bonds to arginine and lysine.
Which of the following forms of RNA complexes with proteins in the nucleus?
A) mRNA B) rRNA C) snRNA D) tRNA
Scientists have direct evidence of Earth's structure to
A) about 2 km (1.2 mi) from the surface. B) the upper mantle (~250 km (155 mi)). C) 10 km (6 mi) from the surface, based on the deepest well shaft. D) the inner core.