The structure of chemotactic cytokines includes which of the following?
A) four helical segments
B) only b-pleated sheet
C) both a-helix and b-pleated sheet
D) four cysteine residues which form two disulfide bridges
D
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Which equation best describes the reaction represented in the illustration above?
A. 2 AB2 + 2 CDA3 + A2 ? 2 DBA4 + 2 CA2 B. 2 AB2 + 2 CDA3 + B2 ? 2 C2A4 + 2 DBA C. 2 AB2 + 2 DCB3 + B2 ? 2 DBA4 + 2 CA2 D. 2 BA2 + 2 CDA3 + A2 ? 2 DBA4 + 2 CA2
Hot spots form linear island chains because
A. they occur along the mid-oceanic ridges. B. they are aligned with trenches formed by subduction. C. the plate moves relative to the underlying hot spot.
The angle of _______________ is the steepest angle at which a slope will remain stable
Fill in the blank with correct word.
Which of the following does NOT happen with warm fronts?
A) Winds commonly shift from southeasterly ahead of the front to southwesterly behind it. B) Dew points typically increase behind the position of the warm front. C) The zone ahead of the warm front generally undergoes decreasing air pressures. D) Cloud cover and precipitation bands are common.