The pain produced in an internal organ may be
perceived as occurring somewhere else. This
phenomenon is called
a. mixed nerve messages.
b. referred pain.
c. phantom pain.
d. psychosomatic pain.
e. hypochondria
B
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Antibiotic therapy is not significantly useful for treating typhoid fever
Indicate whether the statement is true or false.
Most bacterial intestinal infections may be traced to
A. Vibrio spp. B. C. jejuni. C. Salmonella spp. D. Enterobacteriaceae. E. All of the choices are correct.
The ________ develops into the fetal portion of the placenta.
A. archenteron B. amnion C. allantois D. yolk sac E. chorion
In mammals, individuals with two X chromosomes are female, and individuals with an X and a Y chromosome are male
It had long been known that a gene located on the Y chromosome was sufficient to induce the gonads to form testes, which is the main male-determining factor in development, and researchers sought the product of this gene, the so-called testes-determining factor (TDF). For several years, the TDF was incorrectly thought to be a zinc finger protein encoded by a gene called BoY. Which of the following observations would most strongly suggest that BoY might not be the TDF? Explain your answer. (a) Some XY individuals that develop into females have mutations in a different gene, SRY, but are normal at BoY. (b) BoY is not expressed in the adult male testes. (c) Expression of BoY in adult females does not masculinize them. (d) A few of the genes that are known to be expressed only in the testes have binding sites for the BoY protein in their upstream regulatory sequences, but most do not.