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Choose among the given correct pairing o...

Choose among the given correct pairing of nitrogen bases in a DNA.
(A) Adenine with Guanine
(B) Adenine with Thymine
(C ) Adenine with Cytosine
(D) Thymine with Guanine
(E ) Guanine with Cytosine
(F) Thymine with Cytosine

A

A, and D

B

A, and C

C

Both B and E

D

Both B and D

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the correct pairing of nitrogen bases in DNA, we will analyze each option one by one: 1. **Adenine with Guanine (A-G)**: - Adenine (A) is a purine, and Guanine (G) is also a purine. In DNA, purines pair with pyrimidines, not with other purines. Therefore, this pairing is incorrect. 2. **Adenine with Thymine (A-T)**: - Adenine (A) pairs with Thymine (T). This is a correct pairing in DNA. They are held together by two hydrogen bonds. Thus, this option is correct. 3. **Adenine with Cytosine (A-C)**: - Adenine (A) is a purine, and Cytosine (C) is a pyrimidine. However, in DNA, Adenine does not pair with Cytosine. Therefore, this pairing is incorrect. 4. **Thymine with Guanine (T-G)**: - Thymine (T) is a pyrimidine, and Guanine (G) is a purine. However, Thymine does not pair with Guanine in DNA. This pairing is also incorrect. 5. **Guanine with Cytosine (G-C)**: - Guanine (G) pairs with Cytosine (C). This is another correct pairing in DNA, and they are held together by three hydrogen bonds. Thus, this option is correct. 6. **Thymine with Cytosine (T-C)**: - Thymine (T) is a pyrimidine, and Cytosine (C) is also a pyrimidine. In DNA, pyrimidines do not pair with each other; therefore, this pairing is incorrect. ### Summary of Correct Pairings: - The correct pairings identified are: - **B: Adenine with Thymine (A-T)** - **E: Guanine with Cytosine (G-C)** ### Final Answer: The correct pairings of nitrogen bases in DNA are: - **(B) Adenine with Thymine** - **(E) Guanine with Cytosine**
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