11. A major plant macronutrient found in nucleic acids and proteins is

A. calcium
B. nitrogen
C. sulfur
D. iron

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12. What is the metal-ligand in chlorophylls?

A. Copper (Cu)
B. Iron (Fe)
C. Magnesium (Mg)
D. Manganese (Mn)

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13. Nitrosomonas and Nitrobacter obtain their carbon for growth from

A. organic compounds
B. carbon dioxide
C. elementary carbon
D. none of these

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14. Chlorophyll is associated with

A. thylakoids
B. stroma
C. cristae
D. matrix

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15. Organisms capable of converting N₂ to NO₃ are

A. yeasts
B. bacteria
C. roundworms
D. molds

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