**Question:** The sugar found in RNA is

A. Ribose
B. Deoxyribose
C. Galactose
D. Methyl galactose

**Core Concept:** RNA (Ribonucleic Acid) is a nucleic acid molecule involved in genetic information storage and expression. It is composed of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base. The sugar found in RNA is ribose.

**Why the Correct Answer is Right:** Ribose is a pentose sugar that has five carbon atoms. It is the sugar component of RNA nucleotides, which are bonded to a phosphate group and nitrogenous base to form the RNA molecule. The presence of ribose allows RNA to function as a carrier of genetic information in cells.

**Why Each Wrong Option is Incorrect:**

A. Ribose is the correct sugar in RNA, not deoxyribose (found in DNA). Deoxyribose is a related sugar with one less hydrogen atom on the 5 carbon, making it a deoxy compound.

B. Galactose is the sugar found in glycogen, not RNA. Galactose is a hexose sugar, meaning it has six carbon atoms, while ribose has five carbon atoms.

C. Methyl galactose is not a naturally occurring sugar in biochemistry. It is an artificial compound, not found in RNA or any other biological molecules.

**Clinical Pearl:** Understanding the structure and function of nucleic acids, such as RNA, is essential for understanding genetic information storage, replication, and expression. Knowledge of the correct sugars (ribose in RNA) helps medical students, researchers, and clinicians to comprehend molecular biology concepts and their clinical implications.