Which of the following is incorrectly matched?
A) Salt: Formed by the combination of hydrogen ions (H+) and hydroxide ions (OH-)
B) pH: Measure of the acidity or basicity of a solution
C) Acid: Release hydrogen ions (H+) in an aqueous solution
D) Water: Is the solvent in aqueous solutions
E) Base: Release hydroxide ions (OH-) in an aqueous solution
Answer: A
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Transport of a molecule across a cell membrane by facilitated diffusion ____
a. does not exhibit specificity for a particular type of molecule b. requires the input of energy c. depends on a concentration gradient d. goes against the concentration gradient e. allows non-polar uncharged molecules to diffuse across a membrane
Excess sugars stored by high-latitude algae can
a. serve as accessory to cellulose. b. serve as antifreeze in winter. c. keep predators away. d. confuse predators with different colors. e. protect the algae from wave damage.
The ____________________ of STR alleles reveals how often they are observed in a population. Fill in the blank(s) with the appropriate word(s)
After estimating a probit model for the likelihood of a website visitor clicking through conditional on the average income from the county in which the visit's IP address came from, you get the following results: ClickThroughi = -1.8(0.75) + 0.06(0.005)Incomei, where standard errors are reported in parenthesis. What would be the calculation that yields the marginal effect of income moving from $40,000 to $41,000 on the click-through rate?
A. ?[0.06(41 - 40)] B. ?(-1.8 + 0.06 × 41) - ?(-1.8 + 0.06 × 40) C. 0.8 D. -1.8 + 0.06 = -1.74