http://y11evolution. wikispaces. com/file/view/cell_structure http://y11evolution.wikispaces.com/file/view/cell_structure.jpg/30736171/366x270/cell_structure.jpg Eukaryote

Eukaryotic Prokaryotic cells prokaryotic cells lack organelles… eukaryotic cells HAVE organelles click here or here for more information

Nucleus An organism whose cells contain a nucleus surrounded by a membrane and whose DNA is bound together by proteins (histones) into chromosomes. The cells of eukaryotes also contain an endoplasmic reticulum and numerous specialized organelles not present in prokaryotes, especially mitochondria, Golgi bodies, and lysosomes.

Mitochondria Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell. Located in the cytoplasm, they are the sites of cellular respirtation which ultimately generates fuel for the cell's activities. Mitochondria are also involved in other cell processes such as cell division and growth, as well a cell death.

Ribosomes The ribsome is a large and complex molecular machine that catalyzes the synthesis of proteins, referred to as translation. Herein, the ribosome selects aminoacylated transfer RNAs (tRNAs) based on the sequence of a protein encoding messenger RNA and covalently links the amino acids into a polypeptide chain.

Nucleolus The nucleolus is a small dense spherical structure in the nucleus of a cell during interphase. It is also a non-membrane bound structure composed of proteins and nucleic acids found within the nucleus.

Lysomes Lysosome (derived from the Greek words lysis, meaning "to loosen", and soma, "body") is a membrane-bound cell organelle found in animal cells. (They are absent in red blood cells; and fungi have analogous organelles called vacuoles.) They were discovered and named by Belgian biologist Christian de Duve, who eventually received the Nobel Prize in Physiology or Medicine in 1974. They are structurally and chemically spherical vesicles containing acid hydrolases, which are capable ofbreaking down virtually all kinds of biomolecules, including proteins, nucleic acids, carbohydrates, lipids, and cellular debris. They are known to contain more than fifty different enzymes which are all active at an acidic environment of about pH 5. Thus they act as waste disposal system of the cell by digesting unwanted materials in the cytoplasm, both from outside of the cell and obsolete components inside the cell. For this function they are popularly referred to as "suicide bags" or "suicide sacs" of the cell. Further, lysosomes are responsible for cellular homeostasis for their involvements in secretion, plasma membrane repair, cell signalling and energy metabolism, which are related to health and diseases.[1] Depending on their functional activity their sizes can be very different, as the biggest ones can be more than 10 times the smallest ones.[2] ]

Vacuoles Vacuoles are membrane-bounded compartments within some eukaryotic cells that can serve a variety of secretory, excretory, and storage functions. Vacuoles and their contents are considered to be distinct from the cytoplasm, and are classified as ergastic according to some authors.