Definition of GRAVAMEN: The burden or gist of a charge; the grievance or injury specially complained of.In English ecclesiastical law. A grievance complained of by the clergy befo The Law Dictionary Featuring Black's Law Dictionary Free Online Legal Dictionary 2nd Ed.
Phosphate and sugar make up the sides of a DNA ladder.
The reasoning behind the alternation of the sugar and phosphate molecules on a DNA ladder lies in the combination of bases to form the rungs of the ladder. The rungs are only between the sugar molecules. Two bases line up between these molecules and bond together, creating the rung appearance. There are no bases in between the phosphate molecules, thus there are no rungs between these molecules. There is open space that gives the DNA ladder the step appearance. The ladders of DNA that makeup the genes can be twisted or not twisted.