Quaternary structure of haemoglobin consists of .............subunits , two of the subunits are identical and contain ............amino acid residues and the other two subunits are also identical and contain. Amino acid residues.

Explanation

To answer the question regarding the quaternary structure of hemoglobin, we can break it down into clear steps:

### Step-by-Step Solution:

1. **Identify the Number of Subunits in Hemoglobin**:
Hemoglobin has a quaternary structure that consists of **4 subunits**.

2. **Identify the Types of Subunits**:
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