Currently, the best experimental solarcells have an efficiency of about ________ percent.
A. 30
B. 50
C. 65
D. 20
Answer: D
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The arrows drawn perpendicularly to the contour lines on the contour map shown indicate the direction of the groundwater flow. In this example the groundwater is
A. flowing down the slope of the water table from higher contours to lower ones. B. flowing parallel to the slope of the water table from lower contours to higher contours. C. flowing up the slope of the water table from lower contours to higher contours.
The ammonium ion has the formula NH4+. How many nonbonding electrons must be shown in the Lewis structure of the ammonium ion?
A) 0 B) 4 C) 8 D) 9
Which of the following is true of pol II?
A) It must be in its phosphorylated form to cause both the initiation and elongation. B) It must be in its dephosphorylated form to cause both the initiation and elongation. C) It must be in its phosphorylated form to initiate transcription but must be in its dephosphorylated form to cause elongation. D) It must be in its dephosphorylated form to initiate transcription but must be in its phosphorylated form to cause elongation.
The coastal erosion process of ____________________works to remove dissolved ions from rock-forming minerals along the shoreline
Fill in the blank(s) with correct word