______ is the porphyrin most likely to be exclusively excreted in urine, and ______ is the porphyrin most likely to be exclusively excreted in feces.______ has the greatest chance of appearing in either urine or feces.

Question

Quizplus · Accepted Answer

Uroporphyrin contains eight carboxyl groups, coproporphyrin contains four carboxyl groups, and protoporphyrin contains two carboxyl groups.Uroporphyrin is the most polar of the three porphyrins, making it the most water soluble and the most likely to appear in urine.Protoporphyrin is the least polar of the three porphyrins and will likely be excreted only in feces.Coproporphyrin is intermediary in its polarity, allowing this porphyrin to appear in both urine and feces.

______ Is the Porphyrin Most Likely to Be Exclusively Excreted