Animal Cells27 Februari 2010 pukul 15:52 | Ditulis dalam Uncategorized | Tinggalkan komentar
Animal cells are eukaryotic cells, or cells with a membrane-bound nucleus. Unlike prokaryotic cells, DNA in animal cells is housed within the nucleus. In addition to having a nucleus, animal cells also contain other membrane-bound organelles, or tiny cellular structures, that carry out specific functions necessary for normal cellular operation. Organelles have a wide range of responsibilities that include everything from producing hormones and enzymes to providing energy for animal cells.
Animal Cells: Structures and Organelles
The following are examples of structures and organelles that can be found in typical animal cells:
- Centrioles – organize the assembly of microtubules during cell division.
- Cytoplasm – gel-like substance within the cell.
- Endoplasmic Reticulum – extensive network of membranes composed of both regions with ribosomes (rough ER) and regions without ribosomes (smooth ER).
- Golgi Complex – responsible for manufacturing, storing and shipping certain cellular products.
- Lysosomes – sacs of enzymes that digest cellular macromolecules such as nucleic acids.
- Microtubules – hollow rods that function primarily to help support and shape the cell.
- Mitochondria – power producers and the sites of cellular respiration.
- Nucleus – membrane bound structure that contains the cell’s hereditary information.
- Nucleolus – structure within the nucleus that helps in the synthesis of ribosomes.
- Nucleopore – tiny hole within the nuclear membrane that allows nucleic acids and proteins to move into and out of the nucleus.
- Ribosomes – consisting of RNA and proteins, ribosomes are responsible for protein assembly.