Question

question 1
a protein that ultimately functions in the plasma membrane of a cell is most likely to have been synthesized _____________.
answer
on free cytoplasmic ribosomes
in the ribosomes of the mitochondria
in the smooth endoplasmic reticulum
in the plasma membrane
in the rough endoplasmic reticulum
i dont know yet

Explanation:

Proteins destined for the plasma membrane are synthesized on ribosomes attached to the rough endoplasmic reticulum. These proteins are then modified and transported via the endomembrane system to the plasma membrane. Free - cytoplasmic ribosomes synthesize proteins that function in the cytoplasm. Mitochondrial ribosomes synthesize mitochondrial - specific proteins. The smooth endoplasmic reticulum is involved in lipid synthesis and detoxification, not protein synthesis for the plasma membrane. The plasma membrane itself does not synthesize proteins.

Answer:

E. in the rough endoplasmic reticulum