Which of the following endoplasmic reticulum has no ribosome on its surface?
Correct answer: A. smooth
- A. smooth
- B. rough
- C. both
- D. all of above
Explanation
Smooth endoplasmic reticulum lacks ribosomes on its cytoplasmic surface, whereas rough endoplasmic reticulum bears ribosomes and is involved in synthesis of secreted and membrane proteins. The absence or presence of ribosomes is the main structural distinction between the two forms. Students may choose rough by reversing the names, but rough ER is defined by its ribosome-studded appearance.
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About Cytoplasmic Organelles
Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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