The causative organism of whooping cough is ________.
A. Cornyebacterium diphtheriae
B. Haemophilus influenzae
C. Bordetella pertussis
D. Streptococcus pyogenes
E. Streptococcus pneumoniae
Answer: C
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This material provides a mechanism for the maintenance of normal human skin that prevents drying and also is involved in the production of an acid pH to prevent the colonization of poten-tially pathogenic organisms
a. sweat b. bacterocins c. antibodies d. sebum
Erythropoietin, a hormone that stimulates stem cells in the bone marrow to increase erythrocyte production, is
produced in the ____.
a. bone marrow b. heart c. kidneys
d. liver e. lymph nodes
What is the term for immunity gained by the transfer of antibodies across the placental barrier?
A. passive immunity B. acquired immunity C. humoral immunity D. cell-mediated immunity E. auto immunity
The rigid chitinous exoskeleton of an arthropod has all of the following functions except it
A. prevents water loss. B. provides a place for muscle attachment. C. prevents injury to the animal. D. protects the animal from predators. E. maintains a uniform size for all individuals of that species.