[Campbell Biology P.948] Based on Figure 41.2, which of the following statements correctly d... | Practice Question

Based on Figure 41.2, which of the following statements correctly describes the roles of Vitamin B3 and Iron in the depicted biosynthetic reaction?

  • A: Vitamin B3 acts as a cofactor, and Iron acts as a substrate.
  • B: Vitamin B3 is a source of coenzyme NADH, and Iron is a cofactor.
  • C: Vitamin B3 and Iron are both essential amino acids acting as subunits of the enzyme.
  • D: Vitamin B3 is a product of the reaction, and Iron initiates the reaction.

Explanation

Figure 41.2 explicitly labels "Vitamin B3 source of coenzyme NADH " and "Iron cofactor ". The text "The key functions of essential nutrients include serving as substrates of enzymes, as coenzymes, and as cofactors in biosynthetic reactions Figure 41.2 " also supports the general roles.