Greg DePersio has 13+ years of professional experience in sales and SEO and 3+ years as a writer and editor. Simple interest is calculated only on the principal balance of the loan each period.

Elvis Picardo is a regular contributor to Investopedia and has 25+ years of experience as a portfolio manager with diverse capital markets experience. Michael Boyle is an experienced financial ...

Chemical modification describes the modification, addition or removal, through chemical reaction, of any of a variety of macromolecules, including proteins and nucleic acids. It refers to the use of ...