In biology, matrix (plural: matrices) is the material (or tissue) in animal or plant cells, in which more specialized structures are embedded, and a specific part of the mitochondrion that is the site of oxidation of organic molecules. The internal structure of connective tissues is an extracellular matrix. Finger nails and toenails grow from matrices.
The molecules forming the "glue" between cells in connective tissues are summarily referred to as the extracellular matrix.
Bone is a form of connective tissue found in the body and has a storage area, or osteon region, also called matrix that allows mineral salts such as calcium to be stored.
In the mitochondrion, the matrix contains soluble enzymes that catalyze the oxidation of pyruvate and other small organic molecules.
Main article: Nuclear matrix
In the cell nucleus the matrix is the insoluble fraction that remains after extracting the solubled DNA.
The Golgi matrix is a protein scaffold made up of golgins on the cytoplasmic side of the Golgi apparatus involved in keeping its shape and membrane stacking.
A matrix is also a medium in which bacteria are grown (cultured). For instance, a Petri dish of agar may be the matrix for culturing a sample swabbed from a patient's throat.
Tissues and cells
Bioinformatics and sequence evolution
Botany and agriculture
Population biology and ecology