Enables the transfer of D-ribose from one side of a membrane to the other. As beta-D-ribofuranose, D-ribose forms the glycose group of all ribonucleosides, ribonucleotides and ribonucleic acids, and also of ribose phosphates, various glycosides, some coenzymes and some forms of vitamin B12. [ https://www.worldcat.org/search?q=bn%3A0815340729 https://www.worldcat.org/search?q=bn%3A0198506732 GOC:mtg_transport ]