Final answer:
The Cis Golgi is formed by transport vesicles from the endoplasmic reticulum, which fuse with the cis face of the Golgi apparatus and release proteins and lipids for further processing.
Step-by-step explanation:
In the current model of the Golgi apparatus, the Cis Golgi is formed by transport vesicles from the endoplasmic reticulum (ER). These transport vesicles carry proteins and lipids to the Golgi apparatus, where they fuse with the cis face of the Golgi. This is the receiving side of the Golgi apparatus, which is closely associated with the ER. As the vesicles amalgamate with the cis-Golgi network, their content is deposited into the lumen of the Golgi for further processing. Here, proteins and lipids go through modifications such as glycosylation and phosphorylation. Such modifications play a critical role in sorting and tagging these molecules for their correct destinations within or outside the cell.