Multiple choice

Lead poisoning would be expected to result in an elevated level of

  1. aminolevulinic acid

  2. porphobilinogen

  3. biliverdin

  4. heme

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lead poisoning inhibits both ferrochelatase and ALA dehydratase in the heme synthesis pathway, causing accumulation of aminolevulinic acid (ALA) upstream. This occurs because the blocked pathway prevents ALA conversion to downstream products like heme.