noun. 1  a mutation occurring in a somatic cell, resulting in a change in the morphology or some other aspect of one part of an organism (usually a plant). 2  It may be maintained by vegetative propagation but not by sexual reproduction.oun. 1  a mutation occurring in a somatic cell, resulting in a change in the morphology or some other aspect of one part of an organism (usually a plant). 2  It may be maintained by vegetative propagation but not by sexual reproduction.
Protein has a range of essential functions in the body, including the following: 1  Required for building and repair of body tissues (including muscle). 2  Enzymes, hormones, and many immune molecules are proteins. 3  Essential body processes such as water balancing, nutrient transport, and muscle contractions require protein to function. 4  Protein is a 5  ... P Enzymes, hormones, and many immune molecules are proteins. 2  Essential body processes such as water balancing, nutrient transport, and muscle contractions require protein to function. 3  Protein is a source of energy. 4  Protein helps keep skin, hair, and nails healthy.
Here are some examples of functions performed by proteins: 1  form the scaffolding that maintains cell shape. 2  catalyze metabolic reactions. 3  essential in animal diets as a source of certain amino acids. 4  transport molecules within cells and throughout organism. 5  essential for replicating DNA.ere are some examples of functions performed by proteins: 1  form the scaffolding that maintains cell shape. 2  catalyze metabolic reactions. 3  essential in animal diets as a source of certain amino acids. 4  transport molecules within cells and throughout organism. 5  essential for replicating DNA.