The sequence of nitrogen bases in a portion of a DNA segment of a template strand was AAT GCT TAG GCA. What will be the sequence of nitrogen bases in the corresponding region of the transcribed mRNA ?

Options

A. UUT CGT TUC CGA
B. AAT GCT TAG GCA
C. UUA CGA AUC CGU
D. TTA CGA ATC CGT

Answer

To find the sequence of nitrogen bases in the corresponding region of the transcribed mRNA from the given DNA template strand, we will follow these steps:

### Step 1: Identify the Template Strand
The given DNA template strand is:
**AAT GCT TAG GCA**

### Step 2: Understand Base Pairing Rules
In transcription, the base pairing rules are as follows:
- Adenine (A) pairs with Uracil (U) in RNA (instead of Thymine (T) which is found in DNA).
- Thymine (T) in DNA pairs with Adenine (A) in RNA.
- Cytosine (C) pairs with Guanine (G) in both DNA and RNA.
- Guanine (G) pairs with Cytosine (C) in both DNA and RNA.

### Step 3: Transcribe the DNA to mRNA
Now, we will transcribe the DNA sequence to mRNA using the base pairing rules:

1. **A** (from DNA) pairs with **U** (in mRNA)
2. **A** (from DNA) pairs with **U** (in mRNA)
3. **T** (from DNA) pairs with **A** (in mRNA)
4. **G** (from DNA) pairs with **C** (in mRNA)
5. **C** (from DNA) pairs with **G** (in mRNA)
6. **T** (from DNA) pairs with **A** (in mRNA)
7. **T** (from DNA) pairs with **A** (in mRNA)
8. **A** (from DNA) pairs with **U** (in mRNA)
9. **G** (from DNA) pairs with **C** (in mRNA)
10. **C** (from DNA) pairs with **G** (in mRNA)
11. **A** (from DNA) pairs with **U** (in mRNA)

Putting it all together, the mRNA sequence will be:
**UUA CGA AAU CCG U**

### Step 4: Final mRNA Sequence
Thus, the final transcribed mRNA sequence corresponding to the DNA template strand AAT GCT TAG GCA is:
**UUA CGA AAU CCG U**