The anionic polysaccharide pectin can form biomimetic networks which predominantly consist of single biopolymer chains connected by calcium-mediated junction zones of limited extent. As these biopolymeric networks have stress-bearing filaments whose force-extension relations are independently accessible in single-molecule experiments, they thus provide a rather unique test of our current understanding of the relationship between the mechanical properties of a gel and those of its constituent chains. Here we show that remarkable agreement is found between the predictions of a numerical simulation, based solely on the concentration, connectivity, and individual mechanical responses of the biopolyrners, with the experimentally measured bulk network properties.