I will give brainliest!!!!

Protein synthesis can occur on the rough endoplasmic reticulum (ER) but not on the smooth ER.

Which cell structures are attached to the surface of the rough ER that allow it to make proteins?

Choose 1 answer:

(Choice A)
A
DNA strands

(Choice B)
B
Ribosomes

(Choice C)
C
Vacuoles

(Choice D)
D
Chloroplasts