Cell-Get closer to in vivo predictions with Gibco® cell culture systems. Our systems allow you to closely mimic the in vivo state and generate more physiologically relevant data. Each lot of primary cells is performance tested for viability and growth potential.

Cell membrane-Definition: The cell membrane is a thin semi-permeable membrane that surrounds the cytoplasm of a cell, enclosing its contents. Its function is to protect the integrity of the interior of the cell by allowing certain substances into the cell, while keeping other substances out. It also serves as a base of attachment for the cytoskeleton in some organisms and the cell wall in others. Thus the cell membrane also serves to help support the cell and help maintain its shape.

The cell membrane is primarily composed of a mix of proteins and lipids.

While lipids help to give membranes their flexibility, proteins monitor and maintain the cell's chemical climate and assist in the transfer of molecules across the membrane.

Phospholipids are a major component of cell membranes. They form a lipid bilayer in which their hydrophillic (attracted to water) head areas spontaneously arrange to face the aqueous cytosol and the extracellular fluid, while their hydrophobic (repelled by water) tail areas face away from the cytosol and extracellular fluid. The lipid bilayer is semi-permeable, allowing only certain molecules to diffuse across the membrane.

Cell wall-The cell wall is the rigid, semi-permeable protective layer in some cell types. This outer covering is positioned next to the cell membrane (plasma membrane) in most plant cells, fungi, bacteria, algae, and some archaea. Animal cells however, do not have a cell wall. The cell wall conducts many important functions in a cell including protection, structure, and support. Cell wall composition varies depending on the organism. In plants, the cell wall is composed mainly of strong fibers of the carbohydrate polymer cellulose. Cellulose is the major component of cotton fiber and wood and is used in paper production.

Organelle-Cell Biology. a specialized part of a cell havingsome specific function; a cell organ.

Tissue-An aggregate of cells in an organism that have similar structure and function.

Organ-A specialized part of a cell; analogous to an organ; the first organelle to be identified was the nucleus.

Unicellular-having or consisting of one cells.

Multicellular-Having or consisting of many cells or more than one cell to perform all vital functions.