Question

Match List - I with List - II:

List - I	List - II
(A) Adenine	(I)
(B) Cytosine	(II)
(C) Thymine	(III)
(D) Uracil	(IV)

 

Choose the correct answer from the options given below:

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

Hint:

Adenine and guanine are purine bases, whereas cytosine, thymine, and uracil are pyrimidine bases. Purines have a double-ring structure, and pyrimidines have a single-ring structure.

Answer 1

The Correct Option is C

This question involves matching nitrogenous bases from nucleic acids (DNA/RNA) with their corresponding structures.

• Adenine (A) is a purine base, so it corresponds to structure (III).
• Cytosine (B) is a pyrimidine base, so it corresponds to structure (I).
• Thymine (C) is a pyrimidine base found in DNA, so it corresponds to structure (IV).
• Uracil (D) is a pyrimidine base found in RNA, so it corresponds to structure (II).

Thus, the correct matching is:

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

Final Answer: (3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II).

Answer 2

Step 1: Identify the nitrogenous bases involved.
We are given four nitrogenous bases: Adenine (A), Cytosine (B), Thymine (C), and Uracil (D). These bases are found in nucleic acids, specifically DNA and RNA. We need to match each base with its corresponding structure from the options provided.

Step 2: Analyze each base.
- Adenine (A):
Adenine is a purine base, which means it has a two-ring structure. In nucleic acids, adenine pairs with thymine in DNA and with uracil in RNA.
Since it is a purine, it corresponds to structure (III).
- Cytosine (B):
Cytosine is a pyrimidine base, which means it has a one-ring structure. Cytosine is found in both DNA and RNA.
As a pyrimidine, it corresponds to structure (I).
- Thymine (C):
Thymine is a pyrimidine base found only in DNA. Like cytosine, thymine has a one-ring structure.
Since it is a pyrimidine and found in DNA, it corresponds to structure (IV).
- Uracil (D):
Uracil is a pyrimidine base found in RNA, where it pairs with adenine. It also has a one-ring structure.
As a pyrimidine found in RNA, it corresponds to structure (II).

Step 3: Final matching of each base with its structure.
- Adenine (A) matches with structure (III).
- Cytosine (B) matches with structure (I).
- Thymine (C) matches with structure (IV).
- Uracil (D) matches with structure (II).

Final Answer:
\[ \boxed{(3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II).} \]