Question

The organelle with a single layer membrane is

• A. Nucleus
• B. Mitochondria
• C. Ribosome
• D. Lysosomes

Hint:

Remember the main double-membrane organelles using the mnemonic "MNC": Mitochondria, Nucleus, and Chloroplasts.
Most other organelles (like lysosomes, Golgi, and ER) have a single membrane.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Eukaryotic cell organelles are classified based on their surrounding membranes, which can be double, single, or absent.
The nuclear envelope and mitochondrial membrane contain two distinct lipid bilayers, while other organelles are bounded by a single bilayer.

Step 2: Detailed Explanation:
The nucleus is surrounded by a double-membrane system called the nuclear envelope, consisting of inner and outer membranes.
Mitochondria are also double-membraned, containing an outer boundary membrane and a folded inner membrane.
Ribosomes are macromolecular complexes of RNA and protein and lack a lipid membrane entirely.
Lysosomes are spherical, membrane-bound vesicles containing acidic digestive enzymes.
They are enclosed by a single lipid bilayer membrane that contains proton pumps to maintain an acidic internal environment.

Step 3: Final Answer:
Among the options provided, the lysosome is the only organelle enclosed by a single-layer membrane.