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 sequence of bases on the complementary strand of DNA given the sequence ATGCATGCA, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Base Pairing Rules**:
- In DNA, adenine (A) pairs with thymine (T).
- Cytosine (C) pairs with guanine (G).

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

3. **Pair Each Base with its Complement**:
- A (Adenine) pairs with T (Thymine).
- T (Thymine) pairs with A (Adenine).
- G (Guanine) pairs with C (Cytosine).
- C (Cytosine) pairs with G (Guanine).
- Repeat this for each base in the original sequence.

4. **Construct the Complementary Strand**:
- For the first base A, the complementary base is T.
- For the second base T, the complementary base is A.
- For the third base G, the complementary base is C.
- For the fourth base C, the complementary base is G.
- For the fifth base A, the complementary base is T.
- For the sixth base T, the complementary base is A.
- For the seventh base G, the complementary base is C.
- For the eighth base C, the complementary base is G.
- For the ninth base A, the complementary base is T.

5. **Combine the Complementary Bases**:
- Putting it all together, the complementary strand sequence is: **TACGTACGT**.

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

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