Why are most infants with phenylketonuria usually healthy at birth?
a. The defect causing the condition has usually been repaired by that time.
b. The mother breaks down phenylalanine for both herself and her fetus.
c. The infant can produce sufficient quantities of the enzymes needed by birth.
d. Phenylalanine can be completely excreted in infants.
e. Phenylalanine is completely metabolized in infants
B
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Synteny can be described as the:
A. degree of conservation between sequences. B. evolution of orthologs. C. evolution of paralogs. D. conserved gene order between two organisms. E. conserved number of chromosomes between two organisms.
Identical twin raccoons are raised in different environments and yet behave very differently. This is an example of
A) heterozygous alleles. B) the norm of reaction. C) genetic differentiation. D) acclimation.
On the tip of the root, the apical meristem forms the ________, which prevents the meristem from being worn away as it pushes through the soil
A) pericycle B) endodermis C) epidermis D) cortex E) root cap
Which of the following cells can use nonphagocytic means to kill bacteria?
A) eosinophils B) macrophages C) neutrophils D) natural killer cells E) both eosinophils and neutrophils