How do slime supports their weight and reach higher places?

Unlike typical slime that flows and drip from a height, there is a new species of slime that is capable of scaling height in search of food. I am wondering how does a gloopy and slow moving slime without backbone or any kind of cartilage to support its own weight could scale tall places? My slime is biologically immortal but can still die and be digested when eaten by other animals.