With respect to Chargaff's rule, select the option that shows appropriate base pairing.

Options

A. AG, CT
B. AC, GT
C. AT, GC
D. All of these

Answer

To solve the question regarding Chargaff's rule and appropriate base pairing, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Chargaff's Rule**: Chargaff's rule states that in DNA, the amount of adenine (A) is equal to thymine (T), and the amount of guanine (G) is equal to cytosine (C). This means A pairs with T and G pairs with C.

2. **Analyze the Options**:
- **Option A: AGCT**:
- A does not pair with G.
- C does not pair with T.
- Therefore, this option does not follow Chargaff's rule.
- **Option B: ACGT**:
- A does not pair with C.
- G does not pair with T.
- Therefore, this option also does not follow Chargaff's rule.
- **Option C: ATGC**:
- A pairs with T (correct).
- G pairs with C (correct).
- This option follows Chargaff's rule.
- **Option D: All of these**:
- Since only option C is correct, this option is incorrect.

3. **Conclusion**: The only option that shows appropriate base pairing according to Chargaff's rule is **Option C: ATGC**.

### Final Answer:
The correct option that shows appropriate base pairing according to Chargaff's rule is **Option C: ATGC**.

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