What is the difference between smooth endoplasmic reticulum and rough endoplasmic reticulum?
A. Smooth endoplasmic reticulum has ribosomes attached to its surface.
B. Rough endoplasmic reticulum has ribosomes attached to its surface.
C. Rough endoplasmic reticulum has vacuoles attached to its surface.
D. Smooth endoplasmic reticulum has vacuoles attached to its surface.