Question

It will be embedded in the E.R. membrane with domain X facing the lumen of the E.R.

A) This is true for all proteins.
B) This is true for cytoplasmic proteins.
C) This is true for membrane proteins.
D) This is true for secreted proteins.

Answer 1

If a peripheral membrane protein were synthesized in the lumen of the ER, it would end up on the inside of the plasma membrane.

Step-by-step explanation:

If a peripheral membrane protein were synthesized in the lumen (inside) of the ER, it would end up on the inside of the plasma membrane. This is true for membrane proteins. The rough ER is responsible for synthesizing membrane and secretory proteins. After synthesis, these proteins are packaged into vesicles that bud from the ER and fuse with the Golgi apparatus. As they pass through the Golgi, they can undergo modification before being transported to their final destination, which may include the plasma membrane.