An important intestinal pathogen generally acquired from contaminated food or water is
A) Clostridium perfringens.
B) Mycobacterium tuberculosis.
C) Ebola virus.
D) Escherichia coli O157:H7.
Answer: D
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Amniocentesis is a procedure that is normally used
A. to reduce the risk of genetic disease. B. for gene therapy. C. to change the sex of the fetus. D. for diagnosis of genetic disorders. E. for nourishing the fetus.
What determines the development of male or female sex organs in the human embryo?
a. environmental factors b. genes on the X chromosome c. genes on the Y chromosome d. genes on both the X and Y chromosomes e. neither the X or the Y chromosomes
Saturated fats differ from unsaturated fats in that saturated fats
A. are longer. B. lack carbon-carbon double bonds. C. have fewer double bonds. D. cannot be used for an energy source.
Rotational and gravitational equilibrium both involve all of the following except
A. hair cells. B. a gelatinous substance within a chamber. C. the vestibular nerve. D. calcium carbonate granules. E. stereocilia.