negative charge

Hello everyone, sorry i'm not sure if this is the right place to ask this question. My Physiology book says one of the glycocalyx functions is to repel negative charges (since it's negatively charged itslef). My question is, why does a cell need to repel negative charges in the first place? Thanks!

Hello everyone, sorry i'm not sure if this is the right place to ask this question. My Physiology book says one of the glycocalyx functions is to repel negative charges (since it's negatively charged itslef). My question is, why does a cell need to repel negative charges in the first place? Thanks!