Questions: The endomembrane system is a system of interrelated membranes that are all physically connected.

The statement that is false is the first one: "The endomembrane system is a system of interrelated membranes that are all physically connected."

Explanation for each option:

1. The endomembrane system is a system of interrelated membranes that are all physically connected.

   • This statement is false. While the components of the endomembrane system are interrelated, they are not all physically connected. They are connected through vesicles that transport materials between them.

2. The endomembrane system is involved in the synthesis, storage, and export of important molecules.

   • This statement is true. The endomembrane system plays a crucial role in the synthesis of proteins and lipids, storage of substances, and export of molecules out of the cell.

3. The endomembrane system includes the rough and smooth endoplasmic reticulum.

   • This statement is true. Both the rough and smooth endoplasmic reticulum are key components of the endomembrane system.

4. The endomembrane system includes the nuclear envelope.

   • This statement is true. The nuclear envelope is considered part of the endomembrane system as it is continuous with the endoplasmic reticulum.

In summary, the false statement is the first one regarding the physical connection of all components in the endomembrane system.