In lane 1, a size standard was loaded, which contained a mix a DNA fragments known to be 1000 bp, 700 bp, 500 bp, 200 bp, and 100 bp.  When the gel was run and stained, the following photograph of the gel was taken. Click directly on the band in lane 1 that represents the DNA fragment that is 500 bp in size.

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Crime Scene Investigation

A crime scene refers to a place where a crime has occurred. The purpose of crime scene investigation (CSI) is to analyze the complete scene and catch the culprit based on the pieces of evidence collected from the place of crime. The people involved in this process are referred to as crime scene investigators.