DNA stand with the sequance AACGTAACG is transcribed .What is the sequance of mRNA molecule synthesized ?

Options

A. AACGTAACG
B. UUGCAUUGC
C. AACGUAACG
D. TTGCATTGC

Answer

To find the sequence of the mRNA molecule synthesized from the given DNA strand (AACGTAACG), we will follow these steps:

### Step 1: Understand the Base Pairing Rules
In DNA, the base pairing rules are:
- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

In RNA, however, Thymine (T) is replaced by Uracil (U). Therefore, the base pairing rules for transcription from DNA to RNA are:
- Adenine (A) pairs with Uracil (U)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

### Step 2: Write Down the DNA Sequence
The given DNA sequence is:
**AACGTAACG**

### Step 3: Transcribe the DNA Sequence to mRNA
Now, we will transcribe each base of the DNA sequence to its corresponding RNA base using the rules established in Step 1.

- A (from DNA) → U (in mRNA)
- A (from DNA) → U (in mRNA)
- C (from DNA) → G (in mRNA)
- G (from DNA) → C (in mRNA)
- T (from DNA) → A (in mRNA)
- A (from DNA) → U (in mRNA)
- A (from DNA) → U (in mRNA)
- C (from DNA) → G (in mRNA)
- G (from DNA) → C (in mRNA)

### Step 4: Combine the mRNA Bases
Now, we will combine the transcribed bases to form the complete mRNA sequence:
- mRNA sequence: **UUGCAUUGC**

### Final Answer
The sequence of the mRNA molecule synthesized from the DNA strand AACGTAACG is:
**UUGCAUUGC**

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