Which of the following is false regarding to haemoglobin?
Correct answer: D. Each haem in haemoglobin can bind to four O2 molecules
- A. It is a globular protein
- B. It contains organic haem group and inorganic Fe +
- C. Abundantly found in RBCs
- D. Each haem in haemoglobin can bind to four O2 molecules
Explanation
Option D is false. Each haem group in haemoglobin can bind to only one oxygen molecule (O2). Hemoglobin is composed of four protein subunits, each containing a haem group. Therefore, a single hemoglobin molecule can bind up to a maximum of four oxygen molecules.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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