Claim: L-arabinose is more common than D-arabinose with most research has been done on L-arabinose operon which is required for the breakdown of the five-carbon sugar L-arabinose in Escherichia coli.
Evidence: The L-arabinose operon, also called the ara or araBAD operon, is an operon required for the breakdown of the five-carbon sugar L-arabinose in Escherichia coli. However, L-arabinose is in fact more common than D-arabinose in nature and is found in nature as a component of biopolymers such as hemicellulose and pectin. The L-arabinose operon, also known as the araBAD operon, has been the subject of much biomolecular research.