both DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are types of nucleic acids, which are defined as polymers of nucleotides . While they share some components, they have distinct differences: DNA contains the sugar deoxyribose while RNA contains ribose; DNA uses the pyrimidine Thymine, whereas RNA uses Uracil . Furthermore, while DNA is the genetic material for the majority of organisms, RNA only serves as the genetic material in certain viruses . Mastering these core molecular definitions is essential for medical entrance exams, as NCERT textbooks provide the definitive foundation for approximately 95% of NEET Biology questions .