If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on compiementary strand ?

Options

A. ATGCATGCA
B. AUGCAUGCA
C. TACGTACGT
D. UACGUACGU

Explanation

To find the complementary strand of DNA given the sequence ATGCATGCA, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Base Pairing Rules**:
- In DNA, the bases pair according to specific rules:
- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Guanine (G) pairs with Cytosine (C)
- Cytosine (C) pairs with Guanine (G)

2. **Write Down the Given Sequence**:
- The given sequence is: ATGCATGCA

3. **Pair Each Base with Its Complement**:
- A (from the first position) pairs with T
- T (from the second position) pairs with A
- G (from the third position) pairs with C
- C (from the fourth position) pairs with G
- A (from the fifth position) pairs with T
- T (from the sixth position) pairs with A
- G (from the seventh position) pairs with C
- C (from the eighth position) pairs with G
- A (from the ninth position) pairs with T

4. **Construct the Complementary Strand**:
- By pairing each base, we get the complementary strand:
- T (from A)
- A (from T)
- C (from G)
- G (from C)
- T (from A)
- A (from T)
- C (from G)
- G (from C)
- T (from A)

5. **Write the Final Complementary Sequence**:
- The complementary strand is: TACGTACGT

### Final Answer:
The sequence of bases on the complementary strand is **TACGTACGT**.