Question

Which of the following is NOT a component of the Endomembrane system?

• A. Golgi apparatus
• B. Endoplasmic reticulum
• C. Lysosome
• D. Mitochondrion

Hint:

Think of the endomembrane system as a "cellular factory and shipping service" for proteins and lipids. Mitochondria are the "power plants," operating independently of this production line.

Answer 1

The Correct Option is D

Step 1: Core Concept:
The endomembrane system comprises eukaryotic cell organelles that function together to create, alter, package, and move proteins and lipids. The task is to pinpoint the organelle *not* belonging to this system.

Step 2: Breakdown:
The endomembrane system includes:
\[\begin{array}{rl} \bullet & \text{The nuclear envelope } \\ \bullet & \text{The Endoplasmic reticulum (ER) } \\ \bullet & \text{The Golgi apparatus } \\ \bullet & \text{Lysosomes } \\ \bullet & \text{Vacuoles } \\ \bullet & \text{The plasma membrane } \\ \end{array}\] These organelles are linked, either physically or via vesicle transport. The Mitochondrion, along with chloroplasts, is *excluded* from the endomembrane system. Mitochondria, involved in cellular respiration, possess their own distinct membranes and genetic material, likely originating from endosymbiosis.

Step 3: Conclusion:
The Mitochondrion is not part of the endomembrane system.