Match List - I with List - II.

Choose the correct answer from the options given below:

(A)-(I), (B)-(II), (C)-(IV), (D)-(III)

The correct answer is Option 2. (A)-(I), (B)-(II), (C)-(IV), (D)-(III).

Let us break down the matching in detail:

(A) Adenine : (I) Purine

Adenine is a nitrogenous base found in nucleic acids. It is a part of both DNA and RNA. Adenine belongs to the purine class of bases. Purines are characterized by a double-ring structure composed of a six-membered and a five-membered ring fused together. Adenine pairs with thymine in DNA and with uracil in RNA. Adenine is a purine base due to its double-ring structure.

(B) Thymine : (II) Pyrimidine

Thymine is a nitrogenous base that is found in DNA but not in RNA. It belongs to the pyrimidine class of bases. Pyrimidines are characterized by a single-ring structure. In DNA, thymine pairs with adenine through hydrogen bonds. Thymine is a pyrimidine base due to its single-ring structure.

(C) Uracil: (IV) RNA

Uracil is a nitrogenous base found in RNA but not in DNA. It is a pyrimidine base, similar to thymine in its single-ring structure. In RNA, uracil pairs with adenine. Uracil replaces thymine in RNA. Uracil is present in RNA and is not found in DNA.

(D) Deoxyribose: (III) DNA

Deoxyribose is a five-carbon sugar molecule found in the backbone of DNA. It is missing one oxygen atom compared to ribose, which is found in RNA. The presence of deoxyribose is a key distinguishing feature of DNA, whereas RNA contains ribose. Deoxyribose is the sugar component in DNA, distinguishing it from RNA, which contains ribose.