Phenylketonuria (PKU) is a genetic disorder that __________.
A. causes damage to the central nervous system
B. is almost always fatal unless diagnosed immediately after birth
C. results from an extra chromosome on the 21st pair
D. is not apparent in a child's urine or blood samples until age 4 or 5
Answer: A
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The human eye has about ____.?
a. ?the same number of rods and cones b. ?five times more cones than rods c. ?twenty times more rods than cones d. ?one-hundred times more cones than rods
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