The answer is (2) chlorophyll. Chlorophyll contains a magnesium ion, which is a non-transition metal. Vitamin \(B_{12}\) contains a cobalt ion, which is a transition metal. Haemoglobin contains an iron ion, which is also a transition metal. Insulin does not contain any metal ions.
Here are some additional details about the metal ions in biomolecules:
- Chlorophyll: Chlorophyll is a green pigment that is found in plants. It is responsible for absorbing sunlight and using this energy to convert carbon dioxide and water into glucose. The magnesium ion in chlorophyll is located in the center of the porphyrin ring, which is a large molecule that gives chlorophyll its green color.
- Vitamin \(B_{12}\): Vitamin \(B_{12}\) is a water-soluble vitamin that is essential for the production of red blood cells. The cobalt ion in vitamin \(B_{12}\) is located in the center of the corrin ring, which is a large molecule that gives vitamin \(B_{12}\) its red color.
- Haemoglobin: Haemoglobin is a protein that is found in red blood cells. It is responsible for transporting oxygen from the lungs to the tissues. The iron ion in haemoglobin is located in the center of the heme group, which is a large molecule that gives haemoglobin its red color.
- Insulin: Insulin is a hormone that is produced by the pancreas. It is responsible for regulating blood sugar levels. Insulin does not contain any metal ions.
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