In heme synthesis in mammalian cells:

  1. Succinyl CoA and alanine are the immediate substrates for formation of d-aminolevulinic acid
  2. Ferric iron is inserted into protoporphyrin IX
  3. Coproporphyrin IV is an intermediate
  4. Porphobilinogen is formed by the condensation of two molecules of d-aminolevulinic acid

Wrong, please choose another answer

Comments:

  1.  
  2.  
  3. Only the I and III series of porphyrins occur naturally
  4.