The troposphere:
A) is thinnest at the tropics.
B) maintains a relatively constant temperature.
C) is thicker in summer.
D) often disappears near the poles in winter.
Answer: C
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Which of the following is the mechanism of peptide bond formation during protein synthesis?
A) Nucleophilic attack on the carbon of a carbonyl group by an amino group. B) Nucleophilic attack on the nitrogen of an amino group by the carbon of a carbonyl group. C) Nucleophilic attack on the nitrogen of an amino group by the oxygen of a carbonyl group. D) Nucleophilic attack on the oxygen of a carbonyl group by an amino group.
Evidence for the movement of lithospheric plates does NOT include:
a. trends of mountain ranges. b. evidence left by glaciations. c. paleomagnetic data. d. cultural artifacts from ancient humans. e. fossil plant evidence.
A(n) ________ is a gently sloping erosional surface, commonly covered with a veneer of gravel, cut into the solid rock of a mountain.
A. pediment B. bajada C. arroyo D. playa E. cuesta