Question

Which one of the following organelles is enclosed by a single membrane?

• A. Ribosome
• B. Mitochondria
• C. Endoplasmic reticulum
• D. Centrosome

Hint:

Remember that ribosomes and centrosomes are not membrane-bound, while mitochondria have a double membrane structure.

Answer 1

The Correct Option is C

The question requires us to identify which organelle is enclosed by a single membrane. Let's examine each option:

1. Ribosome: Ribosomes are not surrounded by any membrane. They are composed of RNA and proteins and are involved in protein synthesis.
2. Mitochondria: Mitochondria are double-membraned organelles with an outer and an inner membrane. They are the powerhouse of the cell.
3. Endoplasmic Reticulum (ER): The ER is an organelle that is enclosed by a single membrane. It plays a crucial role in the synthesis of proteins and lipids.
4. Centrosome: Centrosomes typically do not have a membrane. They play a crucial role in cell division and contain microtubule-organizing centers.

From the analysis above, the only organelle enclosed by a single membrane is the Endoplasmic Reticulum (ER). Thus, the correct answer is Endoplasmic Reticulum.