In the given polypeptide
Arg- Try -Ile-Asn Gly
C - terminus amino acid is

Options

A. Gly
B. Arg
C. Try
D. Asn

Answer

To determine the C-terminus amino acid in the given polypeptide sequence Arg-Tyr-Ile-Asn-Gly, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Amino Acids**:
Each amino acid has a basic structure consisting of an amino group (-NH2), a central carbon atom (C), a carboxylic acid group (-COOH), and a variable side chain (R group).

2. **Understand Polypeptide Orientation**:
In a polypeptide, the amino acids are linked together by peptide bonds. The sequence of amino acids is always written from the N-terminus (the end with the amino group) to the C-terminus (the end with the carboxylic acid group).

3. **Analyze the Given Sequence**:
The sequence provided is Arg-Tyr-Ile-Asn-Gly. Here, Arg (Arginine) is the first amino acid, and Gly (Glycine) is the last amino acid in the sequence.

4. **Determine the C-terminus**:
The C-terminus of a polypeptide is the last amino acid in the sequence, which has a free carboxylic acid group. In this case, Glycine (Gly) is at the end of the sequence.

5. **Conclusion**:
Therefore, the C-terminus amino acid of the given polypeptide Arg-Tyr-Ile-Asn-Gly is Glycine (Gly).

### Final Answer:
The C-terminus amino acid is Glycine (Gly).

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