Question

Which of the following is/are the bases of DNA?
(A) Adenine
(B) Uracil
(C) Thymine
(D) Cytosine

• A. (A), (B) and (C) only
• B. (B) and (C) only
• C. (A), (C) and (D) only
• D. (A) and (B) only

Answer 1

The Correct Option is C

The bases of DNA are specific nitrogenous compounds that pair up to form the rungs of the DNA ladder. In DNA, the primary bases are:

• (A) Adenine
• (C) Thymine
• (D) Cytosine
• Guanine

It's important to note that Uracil is found in RNA, not DNA. Therefore, the correct bases of DNA from the options provided are (A) Adenine, (C) Thymine, and (D) Cytosine.

Hence, the correct choice is: (A), (C) and (D) only

Answer 2

The bases of DNA are nitrogenous bases that pair to form the structure of the DNA double helix. These bases are:

• Adenine (A): A purine base that pairs with thymine (T) in DNA.
• Thymine (T): A pyrimidine base that pairs with adenine (A) in DNA.
• Cytosine (C): A pyrimidine base that pairs with guanine (G) in DNA.
• Guanine (G): A purine base that pairs with cytosine (C) in DNA.
• Uracil (B) is a base found in RNA, not DNA. It pairs with adenine in RNA but does not appear in DNA.

Thus, the bases of DNA are Adenine (A), Thymine (C), and Cytosine (D).

Therefore, the correct answer is Option C: (A), (C) and (D) only.