If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is: 5'-ATGAATG-3', the sequence of bases in its RNA transcript would be

Options

A. 5'-AUGAAUG-3'
B. 5'-UACUUAC-3'
C. 5'-CAUUCAU-3'
D. 5'-GUAAGUA-3'

Explanation

To determine the sequence of bases in the RNA transcript from the given coding strand of DNA, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Coding Strand**: The coding strand of DNA is given as 5'-ATGAATG-3'.

2. **Understand Base Pairing Rules**: In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). However, in RNA, thymine (T) is replaced by uracil (U).

3. **Transcribe the DNA to RNA**:
- For each base in the coding strand:
- A (adenine) in DNA pairs with U (uracil) in RNA.
- T (thymine) in DNA pairs with A (adenine) in RNA.
- G (guanine) in DNA pairs with C (cytosine) in RNA.
- C (cytosine) in DNA pairs with G (guanine) in RNA.

4. **Convert Each Base**:
- The sequence 5'-ATGAATG-3' translates as follows:
- A → U
- T → A
- G → C
- A → U
- A → U
- T → A
- G → C

5. **Write the RNA Sequence**:
- Putting it all together, the RNA sequence will be: 5'-UACUUAU-3'.

### Final Answer:
The sequence of bases in the RNA transcript would be **5'-UACUUAU-3'**.

---