Here's why:

* Organelles: These are specialized structures within cells that are enclosed by membranes. They perform specific functions, like energy production (mitochondria) or protein synthesis (ribosomes).

* Prokaryotes: These are single-celled organisms that lack a true nucleus and other membrane-bound organelles. Their DNA is located in a region called the nucleoid, but it's not enclosed by a membrane.

While prokaryotes do have some internal structures, like ribosomes and the nucleoid, these are not considered organelles because they lack surrounding membranes.

Some prokaryotes, like bacteria, might have internal membrane systems involved in specific processes like photosynthesis or cellular respiration. These are not considered true organelles but rather invaginations of the plasma membrane.

Therefore, no prokaryote possesses membranous organelles.