Question Detail
Question
The rough ER is so named because it has an abundance of on it: A. Mitochondria B. Vesicles C. Ribosomes D. Golgi Apparatus
Correct Answer
Option C is the correct answer.
Detailed Explanation
The 'rough' appearance of the rough endoplasmic reticulum (RER) under an electron microscope is due to the dense population of ribosomes attached to its cytosolic surface. These ribosomes are actively synthesizing proteins that enter the RER lumen.
Hint
The 'roughness' comes from the tiny dots studding its surface – the protein factories.