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Cyt a(3) possesses...

Cyt `a_(3)` possesses

A

Fe and Cu

B

Fe

C

Mn

D

Fe, Mn + Cl

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**Step-by-Step Solution:** 1. **Understanding Cytochrome a3**: Cytochrome a3 is a component of the electron transport chain, which is crucial for cellular respiration in plants. It plays a significant role in the transfer of electrons and the reduction of oxygen to water. 2. **Identifying Components**: In the context of cytochrome complexes, cytochrome a3 contains specific metal ions that are essential for its function. The key components to consider are iron (Fe) and copper (Cu). 3. **Role of Iron**: Iron is a critical component of the heme group found in cytochromes. The heme group is responsible for the binding and transfer of electrons during the electron transport process. 4. **Role of Copper**: In cytochrome a3, copper is also present. Specifically, cytochrome a contains copper ion A, while cytochrome a3 contains copper ion B. This copper is essential for the proper functioning of the electron transport chain. 5. **Evaluating Options**: - Option 1: Iron and Copper - This is correct as both elements are present in cytochrome a3. - Option 2: Only Iron - This is incorrect as copper is also present. - Option 3: Only Manganese - This is incorrect as manganese is not a component of cytochrome a3. - Option 4: Iron, Manganese, and Chloride - This is incorrect as chloride is not a component, and manganese is not present. 6. **Conclusion**: The correct answer is that cytochrome a3 possesses both iron and copper. **Final Answer**: Option 1: Iron and Copper. ---
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