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. What is the function of an enzyme ? - What is a coenzyme, what are vitamins? Describe the function of Hb and Mb Do you know any Zn-containing enzyme? Is there any metal-organic compound in-vivo? Can you describe the effect of n-bonding on A,? Describe the function of Mn in photosynthesis What are cytochromes? Do you know any redox-active cluster compound? Describe the biological nitrogen fixation