Mark the mismatched pair.

Options

A. Cellulose : Unbranched polymer with `beta`,1-4 glycosidic linkage
B. Cellophone : Cellulose xanthate
C. Carboxypetidase : Exopeptidase, `Mg^(2+)` acts as a co-factor
D. Aminopeptidase : Exopeptidase, cleaves the peptide bond at N-terminal end

Answer

To identify the mismatched pair in the given options, we will analyze each option step by step.

### Step 1: Analyze Cellulose
- **Statement**: Cellulose is an unbranched polymer with beta 1,4 glycosidic linkage.
- **Analysis**: This statement is correct. Cellulose is indeed a linear polymer made up of glucose units linked by beta 1,4 glycosidic bonds.

### Step 2: Analyze Cellophane
- **Statement**: Cellophane is cellulose xanthate.
- **Analysis**: This statement is also correct. Cellophane is derived from cellulose xanthate, which is used in the production of rayon.

### Step 3: Analyze Carboxypeptidase
- **Statement**: Carboxypeptidase acts on the C-terminal of peptide chains.
- **Analysis**: This statement is correct. Carboxypeptidase is an enzyme that cleaves amino acids from the C-terminal end of a peptide.

### Step 4: Analyze Aminopeptidase
- **Statement**: Aminopeptidase acts on the N-terminal of peptide chains.
- **Analysis**: This statement is also correct. Aminopeptidase removes amino acids from the N-terminal end of a peptide.

### Step 5: Identify the Mismatch
- **Final Analysis**: All statements regarding cellulose, cellophane, carboxypeptidase, and aminopeptidase are correct. However, the mention of magnesium ions in relation to carboxypeptidase is incorrect, as carboxypeptidase typically requires zinc ions as a cofactor, not magnesium ions.

### Conclusion
The mismatched pair is the one that incorrectly states the cofactor for carboxypeptidase.

### Mismatched Pair:
- **Carboxypeptidase**: It should mention zinc ions instead of magnesium ions.

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