Children born with phenylketonuria __________.
A. lack the amino acid phenylalanine
B. lack a liver enzyme needed to break down the amino acid phenylalanine
C. have a disorder of lipoid metabolism
D. are unable to metabolize the lipoid phenylalanine
Answer: B
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Approximately one out of four learning-disabled adolescents has been diagnosed specifically with ADHD
Indicate whether this statement is true or false.
Which of the following correctly identifies the path in which sound waves travel in order for hearing to occur?
A) auditory canal, tympanic membrane, ossicles, cochlea B) tympanic membrane, ossicles, auditory canal, cochlea C) cochlea, ossicles, auditory canal, tympanic membrane D) ossicles, cochlea, tympanic membrane, auditory canal E) auditory canal, ossicles, cochlea, tympanic membrane
Which of the following is an example of a normative age-graded change?
A) You have blue eyes even though both of your parents have brown eyes.
B) You are taller now than when you were two years old.
C) You moved to the United States when you were a teen and learned to speak English.
D) You learned to walk before you learned to crawl.
The loudness, pitch, and timbre of a sound are directly related to the __________, respectively, of the vibrations that produced it
A) frequency, amplitude, and complexity B) amplitude, complexity, and frequency C) amplitude, frequency, and complexity D) complexity, frequency, and amplitude E) none of the above