Phenylalanine hydrolase is an enzyme produced by the liver to break down the amino acid phenylalanine. Why would phenylalanine accumulate in patients with phenylketonuria?
A. They lack an inhibitor of the enzyme to break down phenylalanine.
B. They produce too much phenylalanine.
C. They lack the enzyme to break down phenylalanine.
D. They lack the enzyme to produce phenylalanine.
C. They lack the enzyme to break down phenylalanine.
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Genes that encoded for polymerases, gyrases, ribosomal proteins, and other proteins essential to replication, transcription, and translation are present on
A) chromosomes. B) plasmids. C) chromosomes and plasmids. D) neither chromosomes nor plasmids.
Which of the following contributed to the growth in human population that began about 11,000 years ago?
a. sidestepping limiting factors b. increased carrying capacity c. all of the choices d. geographic expansion
Which of the following organ systems are NOT involved in temperature regulation or secretions of
hormones?
a. integumentary system b. circulatory system c. muscular system d. skeletal system e. endocrine system
Which of the following is a characteristic of bogs?
a. low rate of percolation b. high rate of decomposition c. high level of nitrogen d. low amount of vegetation