Which statement is true?
a. Breathing rate and depth are completely under voluntary control.
b. A person can commit suicide by holding his or her breath.
c. The contraction of the diaphragm and muscle of the rib cage are under the control of areas
of the brain.
d. There are chemoreceptors in the brain that monitor carbon dioxide content in the blood
and control breathing.
e. The contraction of the diaphragm and muscle of the rib cage are under the control of areas
of the brain, and there are chemo-receptors in the brain that monitor carbon dioxide
content in the blood and control breathing.
E
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Which of the following cells can serve as antigen-presenting cells?
a. macrophages, basophils, and B cells b. dendritic cells, B cells, and T cells c. macrophages, dendritic cells, and B cells d. B cells, T cells, and basophils e. macrophages, T cells, and basophils
How may recombinant genes be introduced into grain plants?
a. by the use of Ti vectors b. by the use of plasmids as vectors c. by the use of genetic shotguns d. by the use of radioactive probes e. by the use of bacteriophages as vectors
The prokaryotic DNA is located in the
A. pili region. B. capsid region. C. endospore region. D. nucleoid region. E. peptidoglycan region.
The persistence of the sickle-cell anemia allele in some African populations is the result of ____.
A. a high rate of mutation of the normal allele to the sickle-cell anemia allele B. the advantage conferred by the heterozygous form when malaria is prevalent C. nonrandom mating D. a decline in the occurrence of malaria in Africa E. genetic drift