Tick mark the incorrect statement about adult human haemoglobin

Options

A. It is made up of the four sub-units
B. Two sub-units are `alpha`-type and two sub-units of `beta`-type
C. It has quarternary structure of protein
D. It is a simple protein

Answer

To determine the incorrect statement about adult human hemoglobin, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Hemoglobin**:
- Hemoglobin is a protein found in red blood cells (RBCs) that carries oxygen throughout the body and gives blood its red color.

2. **Analyzing the Options**:
- **Option 1**: "It is made up of four subunits."
- **Analysis**: Adult human hemoglobin (HbA) is indeed a tetramer, meaning it is composed of four subunits. This statement is **correct**.

- **Option 2**: "Two subunits are alpha type and two subunits are beta type."
- **Analysis**: Hemoglobin consists of two alpha and two beta subunits. This statement is also **correct**.

- **Option 3**: "It has a quaternary structure of protein."
- **Analysis**: Hemoglobin has a quaternary structure due to the arrangement of its four subunits. This statement is **correct**.

- **Option 4**: "It is a simple protein."
- **Analysis**: Hemoglobin is classified as a conjugated protein because it contains heme groups in addition to its polypeptide chains. This statement is **incorrect**.

3. **Conclusion**:
- The incorrect statement about adult human hemoglobin is: "It is a simple protein."

### Final Answer:
- Tick mark the statement: "It is a simple protein."