Final answer:
Integral membrane proteins in a paramecium are synthesized by ribosomes on the rough endoplasmic reticulum, modified in the Golgi apparatus, and then sent to the plasma membrane.
Step-by-step explanation:
In a paramecium, cell surface integral membrane proteins are synthesized by ribosomes bound to the rough endoplasmic reticulum (RER). The process begins when ribosomes on the RER use RNA to create proteins. These proteins can be destined for various locations, including secretion from the cell, insertion into the cell's own plasma membrane, or internal organelles. As they are synthesized, they may enter the lumen of the RER or become part of the RER membrane. Vesicles bud from the RER and transport these proteins to the Golgi apparatus, where they are further modified and sorted, eventually being packaged and sent to their final destination, such as the plasma membrane.