Linear DNA can be resolved by size using agarose gels of various concentrations. The greater the percentage of agarose, the smaller the linear DNA that can be resolved. The sugar polymers that make up the agarose gel matrix. The greater the agarose concentration, the smaller the pores created in the gel matrix, and the more difficult it is for large linear DNA molecules to move through the matrix. Changing the agarose concentration changes the size of the sieve matrix of the gel.