The information needed would be found on mRNA that is transcribed from a section of DNA. The mRNA is translated by the ribosome into the product polypeptide based on the sequence.
Cysteine -> cystathionine
Carbohydrates such as sugar and starch ,for example are readily broken down into glucose i.e the body's principle source of energy .The glucose can be used by the body as an immediate source of energy. Glucose can be immediately used as fuel, or even can be sent to liver and muscles and stored as glycogen .
