Coenzymes. Coenzymes: A nonprotein component of enzymes is called the cofactor. If the cofactor is organic, then it is called a coenzyme. Coenzymes are relatively small molecules compared to the protein part of the enzyme. Many of the coenzymes are derived from vitamins.
twoâ²-step`. 1. a ballroom dance in duple meter, marked by sliding steps. 2. a piece of music for, or in the rhythm of, this dance.
Two Factor Authentication , also known as 2FA , two step verification or TFA ( as an acronym ) , is an extra layer of security that is known as  multi factor authentication  that requires not only a password and username but also something that only , and only , that user has on them , i.e. a piece of information only they should know or have ...