Question

Pick out the wrong combination.

• A. ${Fe}^{2+}$ - Haemoglobin
• B. ${Se}^{2+}$ - Enzymes of the Kreb's Cycle
• C. ${Mg}^{2+}$ - Photosynthesis
• D. ${Co}^{2+}$ - Vitamin B-12

Answer 1

The correct option is B ${Se}^{2+}$ - Enzymes of the Kreb's Cycle

Kreb's cycle is the sequence of reactions by which most living cells generate energy during the process of aerobic respiration. It takes place in the mitochondria, using up oxygen and producing carbon dioxide and water as waste products, and ADP is converted to energy-rich ATP. ${Se}^{2+}$ or the selenium metal is not present in any of the enzymes in Kreb's cycle.
Whereas ${Fe}^{2+}$ is present in hemoglobin, ${Mg}^{2+}$ is present in chlorophyll and ${Co}^{2+}$ is present in Vitamin $B_{12}$.