Untreated phenylketonuria (PKU)
Untreated phenylketonuria (PKU)
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1. Which manifestation is a characteristic feature of untreated phenylketonuria (PKU)?
| A. | Increased skin pigmentation |
| B. | Excessive urination |
| C. | Fragile bones |
| D. | Small stature |
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2. What is the expected result of a deficiency in the enzyme phenylalanine hydroxylase (PAH)?
| A. | High levels of phenylalanine; low levels of tyrosine |
| B. | High levels of phenylalanine; high levels of tyrosine |
| C. | Low levels of phenylalanine; low levels of tyrosine |
| D. | Low levels of phenylalanine; high levels of tyrosine |
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3. Which substance fails to form normally in individuals with Marfan syndrome?
| A. | Elastin |
| B. | Glycogen |
| C. | Collagen |
| D. | Fibrillin |
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