Which of the Following Statements About Heme Catabolism Is Correct

question 113

Multiple Choice

Which of the following statements about heme catabolism is correct?

• A) iron atoms are excreted as complexes with urobilinogen and stercobilin.
• B) At an early stage, the porphyrin ring is opened to produce biliverdin.
• C) Globin chains are directly re-used to form new hemoglobin molecules.
• D) heme prosthetic groups are transported to the liver where they are used to produce new hemoglobin molecules.
• E) Globin chains are altered and then combine with additional porphyrin rings to form myoglobin.

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