If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be

Options

A. TCCGAACT
B. TACGTAGT
C. TACGAATC
D. TACGAACT

Explanation

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

1. **Identify the Base Pairing Rules**: In DNA, the base pairing rules are as follows:
- 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 sequence of the given DNA strand is:
- ATGCTTGA

3. **Complement Each Base**: Using the base pairing rules, we will find the complementary base for each base in the given sequence:
- A (from ATGCTTGA) pairs with T
- T pairs with A
- G pairs with C
- C pairs with G
- T pairs with A
- T pairs with A
- G pairs with C
- A pairs with T

4. **Construct the Complementary Strand**: Now, we can write down the complementary bases in the same order:
- T (for A)
- A (for T)
- C (for G)
- G (for C)
- A (for T)
- A (for T)
- C (for G)
- T (for A)

5. **Final Sequence**: Putting it all together, the sequence of the complementary strand is:
- TACGAACT

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