If the sequence of bases in one strand of `DNA` is `ATGACTGTC` then the sequence of bases in its complementary strands is:

Options

A. `TACTGACAG`
B. `TUCTGUC CUG`
C. `GUAGTUAUG`
D. None of the above

Answer

To find the complementary strand of the given DNA sequence `ATGACTGTC`, 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)
- Guanine (G) pairs with Cytosine (C)
- Cytosine (C) pairs with Guanine (G)

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

1. **Identify the first base**: The first base in the sequence is `A` (Adenine).
- Complementary base: `T` (Thymine)

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

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

4. **Identify the fourth base**: The fourth base is `A` (Adenine).
- Complementary base: `T` (Thymine)

5. **Identify the fifth base**: The fifth base is `C` (Cytosine).
- Complementary base: `G` (Guanine)

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

7. **Identify the seventh base**: The seventh base is `G` (Guanine).
- Complementary base: `C` (Cytosine)

8. **Identify the eighth base**: The eighth base is `T` (Thymine).
- Complementary base: `A` (Adenine)

9. **Identify the ninth base**: The ninth base is `C` (Cytosine).
- Complementary base: `G` (Guanine)

Now, we can write down the complementary sequence based on our findings:

- Original sequence: `A T G A C T G T C`
- Complementary sequence: `T A C T G A C A G`

Thus, the sequence of bases in the complementary strand is `TAC TGACAG`.