Eukaryotic cells
cytoplasm
the cytoplasm is the material or protoplasm within a living cell, excluding the cell nucleus. It comprises cytosol (the gel-like substance enclosed within the cell membrane) and the organelles – the cell's internal sub-structures. All of the contents of the cells of prokaryote organisms (such as bacteria, which lack a cell nucleus) are contained within the cytoplasm.
ribosome
a simple molecular machine, found within all living cells, that serves as the site of biological protein synthesis (translation). Ribosomes link amino acids together in the order specified by messenger RNA (mRNA) molecules. Ribosomes consist of two major components: the small ribosomal subunit, which reads the RNA, and the large subunit, which joins amino acids to form a polypeptide chain.
flagella
A FLAGELLUM IS A LASH-LIKE APPENDAGE THAT PROTRUDES FROM THE CELL BODY OF CERTAIN PROKARYOTIC AND EUKARYOTIC CELLS. HE PRIMARY ROLE OF THE FLAGELLUM IS LOCOMOTION, BUT IT ALSO OFTEN HAS FUNCTION AS A SENSORY ORGANELLE, BEING SENSITIVE TO CHEMICALS AND TEMPERATURES OUTSIDE THE CELL.
Nucleus
a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
plasma membrane
A MICROSCOPIC MEMBRANE OF LIPIDS AND PROTEINS THAT FORMS THE EXTERNAL BOUNDARY OF THE CYTOPLASM OF A CELL OR ENCLOSES A VACUOLE, AND THAT REGULATES THE PASSAGE OF MOLECULES IN AND OUT OF THE CYTOPLASM.
organelles
a specialized subunit within a cell that has a specific function. Individual organelles are usually separately enclosed within their own lipid bilayers.