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Kaplan Qbank USMLE



Author4 Posts
  #1

a 7 month old female infant is brought to the physician office after having a tonic clonic seizure. Findings include ataxia, hypotonia, hearing loss, hair loss and a rash. Lab show normal plasma amino acid concentrations but abnormal urinary organic acid concentrations consistent with multiple carboxylase deficiency. The administration of which of the following is the most approriate treatment for this patient
a. Biotin
b.Vitamin B2 riboflavin
c.Vitamin B6 pyridoxine
d.Vitamin B12 cyanocobalamin
e.Vitamin C



Ans is A, b/c biotin is a cofactor for carboxylation.

is it right?

  #2

Biotin

  #3

yes, I think so too, cos biotin is the cofactor for caboxylases.

  #4

But the infant has carboxylase deficiency. That mean though we gave him a cofactor nothing should happen right. But I will answer Biotin too.
Carboxylase is the ABC enzyme. It require ATP Biotin and Carbondioxide.smiling face







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