After translation of the polypeptide
in the ribosome, the polypeptide enters the cisternae of the rough endoplasmic reticulum.
Here, the folding of the polypeptide begins with the aid of chaperons proteins.
At the end of the RER, vesicles with the completely folded protein bud off and enters
the Golgi apparatus where the proteins are transported to its destination.
Whereas primary tissues allow for vertical growth, secondary tissues allow for lateral growth: they allow stems and roots to become wider. In roots, the formation of both secondary meristems involves the pericycle.
