Select the correct statements regarding the process of transcription in eukaryotes.
(i) The strand of dsDNA which takes part in transcription process is called as coding strand.
(ii) The enzyme RNA polymerase can catalyse polymerisation only in one direction i.e. ,`5' rarr 3'` .
(iii) An unusual nucleotide methyl guanosine triphosphate is added to the 5' end of hnRNA during capping.
(iv) During tailing process, adenylate residues (200-300) are added at 3' end in a template independent manner.

Options

A. (i) and (ii)
B. (iii) and (iv)
C. (ii),(iii) and (iv)
D. (i),(ii),(iii) and (iv)

Explanation

To solve the question regarding the process of transcription in eukaryotes, we will analyze each statement one by one and determine their correctness.

### Step-by-Step Solution:

1. **Statement (i)**: "The strand of dsDNA which takes part in transcription process is called as coding strand."
- **Analysis**: In eukaryotic transcription, the strand of DNA that serves as the template for RNA synthesis is known as the template strand (or non-coding strand), while the other strand is referred to as the coding strand. Therefore, this statement is **incorrect**.

2. **Statement (ii)**: "The enzyme RNA polymerase can catalyse polymerisation only in one direction i.e., 5' to 3'."
- **Analysis**: RNA polymerase synthesizes RNA by adding nucleotides in the 5' to 3' direction. This statement is **correct**.

3. **Statement (iii)**: "An unusual nucleotide methyl guanosine triphosphate is added to the 5' end of hnRNA during capping."
- **Analysis**: During the capping process, a modified guanosine triphosphate known as 7-methylguanylate (7mG) is added to the 5' end of the heterogeneous nuclear RNA (hnRNA). Thus, this statement is **correct**.

4. **Statement (iv)**: "During tailing process, adenylate residues (200-300) are added at 3' end in a template independent manner."
- **Analysis**: The addition of a poly-A tail (adenylate residues) to the 3' end of the mRNA occurs in a template-independent manner, and typically consists of about 200-300 adenine nucleotides. Therefore, this statement is **correct**.

### Conclusion:
Based on the analysis:
- Statement (i) is incorrect.
- Statements (ii), (iii), and (iv) are correct.

Thus, the correct answer is that statements (ii), (iii), and (iv) are true.

### Final Answer:
**The correct statements regarding the process of transcription in eukaryotes are (ii), (iii), and (iv).**

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