If one strand of DNA has the sequence ATCGTATG , the sequence in the complementary strand would be

Options

A. TAGCTTAC
B. TCACATAC
C. TAGCATAC
D. TACGATAC

Answer

To find the complementary strand of DNA given the sequence ATCGTATG, we need to follow the base pairing rules of DNA. The rules state that:

- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

Now, let's go through the sequence step by step:

1. **Identify the first base in the original strand**:
- The first base is **A** (Adenine).
- The complementary base is **T** (Thymine).

2. **Identify the second base**:
- The second base is **T** (Thymine).
- The complementary base is **A** (Adenine).

3. **Identify the third base**:
- The third base is **C** (Cytosine).
- The complementary base is **G** (Guanine).

4. **Identify the fourth base**:
- The fourth base is **G** (Guanine).
- The complementary base is **C** (Cytosine).

5. **Identify the fifth base**:
- The fifth base is **T** (Thymine).
- The complementary base is **A** (Adenine).

6. **Identify the sixth base**:
- The sixth base is **A** (Adenine).
- The complementary base is **T** (Thymine).

7. **Identify the seventh base**:
- The seventh base is **T** (Thymine).
- The complementary base is **A** (Adenine).

8. **Identify the eighth base**:
- The eighth base is **G** (Guanine).
- The complementary base is **C** (Cytosine).

Now, putting all the complementary bases together, we get the complementary strand:

- Original strand: **A T C G T A T G**
- Complementary strand: **T A G C A T A C**

Thus, the sequence in the complementary strand would be **TAGCATAC**.

### Final Answer:
The complementary strand is **TAGCATAC**.