How many molecules of oxygen can one haemoglobin molecule transport?

Explanation

To determine how many molecules of oxygen one hemoglobin molecule can transport, we can follow these steps:

1. **Understand the Structure of Hemoglobin**: Hemoglobin is a protein made up of four subunits. Specifically, it consists of two alpha (α) chains and two beta (β) chains.

2. **Identify the Heme Groups**: Each of these subunits contains a heme group, which is a component that contains iron (Fe).

3. **Recognize the Role of Iron**: Each heme group has one iron atom that is capable of binding to one molecule of oxygen (O₂).

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