Adrenoleukodystrophy is caused by deficiency of a protein in the outer membrane of
A. cells.
B. peroxisomes.
C. lysosomes.
D. mitochondria.
Answer: B
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The external portion of the ear that catches sound waves is the:
A) auricle B) pinna C) cerumen D) A and B
Which of the following is an evolutionary hypothesis to explain morning sickness?
A. It alerts the woman that she is pregnant so that she is careful not to expose herself to harmful substances. B. It is a natural form of birth control. C. It is an adaptation to protect the embryo from toxins. D. It prevents too much weight gain during pregnancy. E. It is a vestigial artifact left over from early mammalian ancestors.
Which papillae, distributed on the anterior two-thirds of the tongue surface, actually lack taste buds?
A. Papiform B. Filiform C. Fungiform D. Vallate E. Foliate
An atom or group of atoms with a charge is called a(n)
A. isotope. B. compound. C. molecule. D. ion.