which of the following is a mechanism that is thought to be responsible for maintaining proteins in a particular organelle, like the er or the golgi complex? 1) retention of molecules resident in an organelle that are excluded from transport vesicles 2) destruction of proteins that find their way mistakenly into transport vesicles 3) retrieval of molecules that have left the compartment in which they normally reside 4) solubilization in the cytoplasm and refolding by chaperons