2D chromatography is so named because ____
a. there are two steps: labeling with a radioactive marker and separation via chromatography
b. the molecules are separated into a linear arrangement, meaning two dimensions
c. the process separates the molecules in two directions, first along the x axis and then along the y axis
d. two different solutions are used in the paper chromatography process
e. two different types of radioactive markers must be used
ANSWER: c
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Fill in the blank with the appropriate word.
Which of the following statements about global warming and the greenhouse effect is correct?
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Indicate whether the statement is true or false