Which of the Following is Not True of Eukaryotic Ribosomes

Question

Which of the following is not true of eukaryotic ribosomes?
A) They are macromolecular machines
B) They function in the biosynthesis of proteins
C) They contain ribosomal RNA
D) They consist of two unequally sized subunits
E) They are attached to the smooth ER

Accepted Answer

Eukaryotic ribosomes are not attached to the smooth endoplasmic reticulum (ER); they are either free in the cytoplasm or attached to the rough ER, which is characterized by the presence of ribosomes on its surface.