Which country is the leading source of immigrants to the United States?
A) China
B) Mexico
C) Spain
D) Cuba
E) Colombia
Answer: B) Mexico
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An amino acid is an organic molecule that contains both an amine group and a carboxyl group. At an acidic pH, which structure is most likely?
A. Structure (a) B. Structure (b) C. Structure (c) D. All three structures are equally possible.
Protein synthesis proceeds in which direction?
A) from the C-terminus to the N-terminus B) from the middle towards the two ends C) from the N-terminus to the C-terminus D) the direction varies from one protein to another
What is the greatest source of oxygen in deep water?
a. The respiration from bacteria b. The lack of large quantities of organisms c. Chemosynthesis d. Polar waters that have sunk from the surface
The process by which plants give up moisture to the air is:
a. evaporation. b. transpiration. c. evapotranspiration. d. none of these