What is the composition of a DNA fragment? That is, what is a DNA fragment made of?

 

DNA fragments are made of molecules called nucleotides. Each nucleotide is made up of a sugar group, a phosphate group, and a nitrogen base.

 

Using the lane numbers on the electrophoresis instrument, list the samples from smallest DNA fragment to largest DNA fragment. Label the largest and smallest.

 

Lane 4 had the smallest DNA fragment while lane 2 had the largest.  

 

Largest- Lane 2, Lane 1, Lane 3, Lane 5, Lane 4- Smallest

 

 

 

 What accounts for the different final locations of the different size DNA fragments?

 That is, why do different sized DNA fragments end at different locations on the electrophoresis instrument?