What are the functions of
(i) methylated guanine cap?
(ii) poly-A 'tail' in a mature on RNA ?

Explanation

### Step-by-Step Solution:

**(i) Functions of Methylated Guanine Cap:**
1. **Attachment to Ribosome:** The methylated guanine cap (often referred to as the 5' cap) is crucial for the binding of mRNA to the small subunit of the ribosome during the initiation of translation. This cap structure is recognized by the ribosomal machinery, facilitating the assembly of the ribosome on the mRNA.

2. **Stability of mRNA:** The methylated guanine cap also plays a role in stabilizing the mRNA molecule. It protects the mRNA from degradation by exonucleases, which are enzymes that can degrade RNA from the ends.

3. **Regulation of Translation:** The cap structure is involved in the regulation of translation efficiency. It helps in the recruitment of translation initiation factors that are essential for the start of protein synthesis.
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