The m-RNA molecule is synthesized from the DNA by the RNA-polymerase by reading the

Options

A. Coding strand in the 3'-5' direction
B. coding strand in the 5'-3' direction
C. Anticoding strand in the 3'-5' direction
D. Anticoding strand in the 5'-3' direction

Answer

To answer the question "The m-RNA molecule is synthesized from the DNA by the RNA-polymerase by reading the," we can break down the solution step by step as follows:

### Step-by-Step Solution:

1. **Understanding the Process of Transcription**:
- The synthesis of mRNA from DNA occurs through a process called transcription. During transcription, RNA polymerase reads the DNA and synthesizes mRNA.

2. **Identifying the DNA Strands**:
- DNA consists of two strands: the coding strand and the anti-coding strand (also known as the template strand).
- The coding strand has the same sequence as the mRNA (except for the substitution of uracil for thymine).

3. **Determining the Template Strand**:
- The mRNA is synthesized from the anti-coding strand (template strand), which serves as the template for RNA polymerase to read and create the complementary mRNA strand.

4. **Direction of Reading**:
- RNA polymerase reads the anti-coding strand in the 3' to 5' direction. As it reads this strand, it synthesizes the mRNA in the 5' to 3' direction.

5. **Evaluating the Options**:
- Now, we can evaluate the options provided in the question:
- **Coding strand in the 3' to 5' direction**: Incorrect, as mRNA is not synthesized from the coding strand.
- **Coding strand in the 5' to 3' direction**: Incorrect, for the same reason.
- **Anti-coding strand in the 3' to 5' direction**: Correct, as this is the direction in which RNA polymerase reads the template strand.
- **Anti-coding strand in the 5' to 3' direction**: Incorrect, as this does not represent the reading direction.

6. **Conclusion**:
- The correct answer is **anti-coding strand in the 3' to 5' direction**.

### Final Answer:
The m-RNA molecule is synthesized from the DNA by the RNA-polymerase by reading the **anti-coding strand in the 3' to 5' direction**.

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