The sequence of an mRNA molecule produced from a DNA template strand with the composition
5'-AGCTACACT-3' is

Options

A. 5' - AUGUAGCU - 3
B. 5'- UCGAUGUGA-3'
C. 5'- AGTGTAGCT - 3'
D. 5' - TCGATGTGA - 3'

Answer

To determine the sequence of the mRNA molecule produced from the given DNA template strand (5'-AGCTACACT-3'), we need to follow these steps:

### Step 1: Identify the DNA Template Strand
The provided DNA template strand is:
5'-AGCTACACT-3'

### Step 2: Write the Complementary DNA Strand
The complementary DNA strand is synthesized based on base pairing rules:
- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

Thus, the complementary DNA strand (3'-TCGATGTGA-5') can be written as:
3'-TCGATGTGA-5'

### Step 3: Transcribe the DNA to mRNA
During transcription, the DNA template strand is used to synthesize mRNA. The base pairing rules for RNA are:
- Adenine (A) pairs with Uracil (U) instead of Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

Using the complementary DNA strand (3'-TCGATGTGA-5'), we transcribe it to mRNA:
- T (from DNA) → A (in mRNA)
- C (from DNA) → G (in mRNA)
- G (from DNA) → C (in mRNA)
- A (from DNA) → U (in mRNA)
- T (from DNA) → A (in mRNA)
- G (from DNA) → C (in mRNA)
- T (from DNA) → A (in mRNA)
- G (from DNA) → C (in mRNA)
- A (from DNA) → U (in mRNA)

Thus, the mRNA sequence is:
5'-UCGAUGUGA-3'

### Final mRNA Sequence
The final mRNA sequence produced from the DNA template strand is:
5'-UCGAUGUGA-3'