Mark the incorrect example.

Options

A. Keratin and myosin-Fibrous proteins
B. Insulin and albumins -Globular proteins
C. Glycylalanine-Dipeptide
D. Enzymes and haemoglobin -Derived proteins

Explanation

To determine the incorrect example from the given options, we will analyze each option step by step.

### Step 1: Analyze Option 1
- **Statement**: Keratin and myosin are fibrous proteins.
- **Explanation**: Keratin and myosin are indeed fibrous proteins. They have a thread-like structure and are linear in shape, which is characteristic of fibrous proteins.
- **Conclusion**: This statement is **correct**.

### Step 2: Analyze Option 2
- **Statement**: Insulin and albumin are globular proteins.
- **Explanation**: Insulin and albumin are both globular proteins. They have a spherical shape and are folded, which is typical for globular proteins.
- **Conclusion**: This statement is **correct**.

### Step 3: Analyze Option 3
- **Statement**: Glycylanine is a dipeptide.
- **Explanation**: Glycylanine is formed from glycine and alanine. When these two amino acids combine through a peptide bond (removing water), they form a dipeptide. The structure described matches that of a dipeptide.
- **Conclusion**: This statement is **correct**.

### Step 4: Analyze Option 4
- **Statement**: Enzymes and hemoglobin are derived proteins.
- **Explanation**: This statement is incorrect. Hemoglobin is a conjugated protein, made up of heme (a non-protein component) and globin (a protein component). Enzymes can also be classified as globular proteins and are not derived proteins.
- **Conclusion**: This statement is **incorrect**.

### Final Answer
- The incorrect example is **Option 4**: Enzymes and hemoglobin are derived proteins.

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