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 chain, follow these steps:

### Step-by-Step Solution:

1. **Identify the Polypeptide Sequence**: The given polypeptide sequence is Arg-Try-Ile-Asn-Gly.

2. **Understand the Terminology**: In a polypeptide chain:
- The **N-terminus** (or amino terminal) is the end of the chain that has a free amino group (-NH2).
- The **C-terminus** (or carboxy terminal) is the end of the chain that has a free carboxyl group (-COOH).

3. **Determine the Directionality**: Polypeptides are synthesized from the N-terminus to the C-terminus. Therefore, the first amino acid in the sequence is at the N-terminus, and the last amino acid is at the C-terminus.

4. **Locate the C-terminus**: In the sequence Arg-Try-Ile-Asn-Gly:
- Arg is at the N-terminus.
- Gly is the last amino acid in the sequence, making it the C-terminus.

5. **Conclusion**: The C-terminus amino acid of the given polypeptide chain is Gly.

### Final Answer:
The C-terminus amino acid is **Gly**.

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