What important jobs does our Laemmli Sample Buffer do for us? a. purifies GST-DHFR-His using Ni-resin b. provides a dye that can allow visual tracking of gel running progress c. coats proteins with net negative charge d. denatures proteins e. coats proteins with net positive charge f. coats proteins with SDS g. converts complex protein structures into a linear string of amino acids h. weighs the sample down for easier gel loading