A newborn male is diagnosed with albinism based on skin, eye, and hair appearance. Which finding will support this diagnosis?
a. Increased melanin
b. Increased hemoproteins
c. Inability to convert tyrosine to DOPA (3,4-dihydroxyphenylalanine)
d. Inability to convert bile to bilirubin
ANS: C
The person with albinism is unable to convert tyrosine to DOPA, an intermediate in melanin bio-synthesis. An increase in melanin would cause skin to be darker. Hemoprotein accumulations in cells are caused by excessive storage of iron, which is transferred to the cells from the blood-stream. An inability to convert bile to bilirubin would not lead to albinism.
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