Cold aclimation response
The process by which plants increase their tolerance to freezing by exposure to low,
nonfreezing temperatures.
Coleoptile
The sheath enclosing the apical meristem and leaf primordia of a germinating monocot.
Coleorhizae
A protective sheath enclosing the embryonic root of grasses.
Collagen
A glycoprotein in the extracellular matrix of animal cells that forms strong fibers, found
extensively in connective tissue and bone; the most abundant protein in the animal
kingdom.
Collecting duct
The location in the kidney where filtrate from renal tubules is collected; the filtrate is now
called urine.
Collenchyma cell
A flexible plant cell type that occurs in strands or cylinders that support young parts of the
plant without restraining growth.
Cholesterol metabolism
A white crystalline substance, C 27 H 45 OH, found in animal tissues and various foods, that is
normally synthesized by the liver and is important as a constituent of cell membranes and a
precursor to steroid hormones. Its level in the bloodstream can influence the pathogenesis
of certain conditions, such as the development of atherosclerotic plaque and coronary
artery disease.
Colonial
Living in, consisting of, or forming a colony.
An inhabitant of a colony.
Colony
A group of organisms of the same species living together in close association.
Columnar
In biology, columnar refers to the shape of epithelial cells that are taller than they are wide
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