Like DNA Microarrays,Northern Blots Analyze the Levels of MRNA

question 7

Multiple Choice

Like DNA microarrays,Northern blots analyze the levels of mRNA.However,Northern blots are almost always prepared with a probe tagged with one label,whereas DNA microarrays almost always use two groups of probes,each one tagged with a different fluorescent label.What advantage is conferred by using two labels for the microarray probes?

• A)The two labels increase the sensitivity of the microarray.
• B)The two labels allow the analysis of the expression of more genes.
• C)The two labels allow simultaneous assay of levels of DNA and RNA.
• D)The two labels allow comparison of gene expression between two samples.
• E)Probing the array with two labels is equivalent to doing two experiments at once.

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