BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Ribose is a single-ring pentose [5-Carbon] sugar. The numbering of the carbon atoms runs clockwise, following organic chemistry rules. Note the absence of the hydroxyl (-OH) group on the 2’ carbon in the deoxy-ribose sugar in DNA as compared with the ribose sugar in RNA.

Detailed explanation-2: -The major forms of ribose are the 3’-endo pucker (commonly adopted by RNA and A-form DNA) and 2’-endo pucker (commonly adopted by B-form DNA).

Detailed explanation-3: -RNA has a hydroxyl functional group at that 2’ position of the pentose sugar; the sugar is called ribose, hence the name ribonucleic acid. By contrast, DNA lacks the hydroxyl group at that position, hence the name, “deoxy” ribonucleic acid.

Detailed explanation-4: -ribose, also called D-ribose, five-carbon sugar found in RNA (ribonucleic acid), where it alternates with phosphate groups to form the “backbone” of the RNA polymer and binds to nitrogenous bases.

Detailed explanation-5: -Ring Structure for Ribose The exception is that ribose is a pentose, five carbons. Therefore a five membered ring is formed. The-OH on carbon #4 is converted into the ether linkage to close the ring with carbon #1. This makes a 5 member ring-four carbons and one oxygen.