Final answer:
Membrane-bound organelles are held in place by the cytoskeleton and structural proteins, with their lipid bilayer membranes allowing for selective interaction and compartmentalization.
Step-by-step explanation:
Membrane-bound organelles such as the endoplasmic reticulum (ER), Golgi apparatus, mitochondria, and chloroplasts are held in their relative locations in the cell by a combination of structural proteins, the cytoskeleton, and by being physically tethered to other organelles or the cytoplasm.
The cytoskeleton, composed of microtubules and microfilaments, provides a framework that organizes the positions of organelles and can influence their movement and function. Additionally, the lipid bilayer membrane of each organelle, similar to the cell membrane, allows for selective interaction and compartmentalization of functions within the cell, ensuring each organelle remains in the proper location to perform its specific role efficiently.