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Eukaryotic cell have membrane bound cell organelles. But prokaryotes does not have membrane bound cell organelles. Centiole and ribosomes are non membrane bound organelles. Are centriole and ribosome present in prokarotic cells ? And what are the other organelles present in the prokaryotic cells?
There are four main structures shared by all prokaryotic cells, bacterial or Archaean:

    The plasma membrane, Cytoplasm,
    Ribosomes    
    Genetic material (DNA and RNA)
Some prokaryotic cells also have other structures like the cell wall, pili (singular pillus), and flagella (singular flagellum). Each of these structures and cellular components plays a critical role in the growth, survival, and reproduction of prokaryotic cells.
Prokaryotic cells  have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid. Example: Bacteria, the following structures can be found in bacterial cells:

    Capsule - Found in some bacterial cells, this additional outer covering protects the cell when it is engulfed by other organisms, assists in retaining moisture, and helps the cell adhere to surfaces and nutrients.

    Cell Wall - Outer covering of most cells that protects the bacterial cell and gives it shape.

    Cytoplasm - A gel-like substance composed mainly of water that also contains enzymes, salts, cell components, and various organic molecules.

    Cell Membrane or Plasma Membrane - Surrounds the cell's cytoplasm and regulates the flow of substances in and out of the cell.

    Pili - Hair-like structures on the surface of the cell that attach to other bacterial cells. Shorter pili called fimbriae help bacteria attach to surfaces.

    Flagella - Long, whip-like protrusion that aids in cellular locomotion.

    Ribosomes - Cell structures responsible for protein production.

    Plasmids - Gene carrying, circular DNA structures that are not involved in reproduction.

    Nucleiod Region - Area of the cytoplasm that contains the single bacterial DNA molecule.


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