Which technique is primarily used for analyzing PCR products due to high resolution?

Which technique is primarily used for analyzing PCR products due to high resolution?

• A. Capillary Electrophoresis (CE)
• B. Thin Layer Chromatography (TLC)
• C. High Performance Liquid Chromatography (HPLC)
• D. Gas Chromatography/Mass Spectrometry

Answer: (A)

Capillary Electrophoresis provides the highest resolution needed to separate and size PCR products that differ by very small amounts, even a single base pair. In this approach, fluorescently labeled DNA fragments are run through a thin capillary filled with a sieving polymer. The electric field pushes the fragments, and smaller pieces travel faster, creating a precise separation by length. A laser detector reads the fluorescence as fragments pass, producing an electropherogram where each peak corresponds to a specific fragment length. This setup allows accurate sizing and rapid analysis of many PCR products, which is why it’s widely used for fragment analysis and genotyping. The other methods aren’t suited for this purpose. Thin Layer Chromatography, High Performance Liquid Chromatography, and Gas Chromatography/Mass Spectrometry are geared toward separating and identifying small molecules or volatile compounds, not the high-resolution sizing of DNA fragments, so they aren’t the go-to choices for analyzing PCR products.

Capillary Electrophoresis provides the highest resolution needed to separate and size PCR products that differ by very small amounts, even a single base pair. In this approach, fluorescently labeled DNA fragments are run through a thin capillary filled with a sieving polymer. The electric field pushes the fragments, and smaller pieces travel faster, creating a precise separation by length. A laser detector reads the fluorescence as fragments pass, producing an electropherogram where each peak corresponds to a specific fragment length. This setup allows accurate sizing and rapid analysis of many PCR products, which is why it’s widely used for fragment analysis and genotyping.

The other methods aren’t suited for this purpose. Thin Layer Chromatography, High Performance Liquid Chromatography, and Gas Chromatography/Mass Spectrometry are geared toward separating and identifying small molecules or volatile compounds, not the high-resolution sizing of DNA fragments, so they aren’t the go-to choices for analyzing PCR products.