Question

question # 7
multiple choice
tandem mass spectrometry is used to obtain _.
gas chromatography
dna fingerprints
greater accuracy
legal results

Explanation:

Tandem mass spectrometry (\(MS - MS\)) involves two mass - spectrometry steps. The first step selects ions of interest, and the second step further analyzes them (e.g., by fragmentation). This two - step process allows for more detailed analysis compared to single - stage mass spectrometry, leading to greater accuracy in determining molecular structures, masses of fragments, etc. Gas chromatography is a separate technique (involving separation of volatile compounds based on their partitioning between a mobile gas phase and a stationary phase). DNA fingerprints are obtained through techniques like PCR (Polymerase Chain Reaction) and gel electrophoresis. Legal results are a broad outcome that many scientific techniques (including proper use of mass spectrometry) can contribute to, but it is not the specific purpose of tandem mass spectrometry.

Answer:

greater accuracy