Determine if the statement is true or false considering the different metal ions, especially iron, copper, zinc, and manganese:
The mentioned metal ions do not serve a function in the ETC and ATP synthesis.
Explain your answer.

• A. True, the mentioned metals are not present in the ETC and ATP synthesis because they are toxic and inhibit biochemical processes.
• B. True, the mentioned metals are not present in the ETC and ATP synthesis because metals cannot be involved in organic reactions.
• C. False, the mentioned metals are present in the ETC and ATP synthesis, mainly functioning as an energy source.
• D. False, the mentioned metals are present in the ETC and ATP synthesis, mainly functioning as reducing and oxidizing agents.

Answer: (D)