AGCT are nitrogenous bases of DNA. The pairing is

Options

A. A-G, C-T.
B. A-T,G–C
C. A-C,G-T.
D. A-T,G- T

Answer

To solve the question about the pairing of the nitrogenous bases in DNA (A, G, C, T), we can follow these steps:

### Step 1: Identify the Nitrogenous Bases
The nitrogenous bases mentioned in the question are:
- A = Adenine
- G = Guanine
- C = Cytosine
- T = Thymine

### Step 2: Classify the Bases
Classify the bases into two categories:
- **Purines**: Adenine (A) and Guanine (G)
- **Pyrimidines**: Cytosine (C) and Thymine (T)

### Step 3: Apply Chargaff's Rule
According to Chargaff's Rule, in DNA:
- The amount of Adenine (A) is equal to Thymine (T): A = T
- The amount of Guanine (G) is equal to Cytosine (C): G = C

This means that:
- A pairs with T
- G pairs with C

### Step 4: Write the Pairing
From the above information, we can summarize the base pairing in DNA as follows:
- A pairs with T (A - T)
- G pairs with C (G - C)

### Step 5: Conclusion
Thus, the correct pairing of the nitrogenous bases in DNA is:
- A - T
- G - C

### Final Answer
The pairing is A-T and G-C.

---