Development of new vaccines has slowed in recent decades. This is due to
A) the ineffectiveness of vaccines against disease.
B) the availability of vaccines against nearly all serious diseases.
C) the high cost of development.
D) the high level of risk with immunization.
E) a lack of need with modern medical treatments.
C
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Body parts that are similar in different lineages because they are adapted to the same environment are ____
a. homologous structures b. comparative structures c. analogous structures d. repetitive structures e. vestigial structures
Respiratory acidosis results when __________ are produced more rapidly than they are removed
a. oxygen molecules b. carbon dioxide molecules c. chloride ions d. hydrogen ions e. carbonic anhydrase molecule
Plasma cells
A. produce antibodies. B. kill infected cells. C. mature in the thymus. D. remain present in the body at low levels after an infection. E. secrete cytokines.
Which of the following is not a type of chemotherapy?
A. bone marrow transplants B. antitumor antibiotics C. mitotic inhibitors D. antimetabolites E. alkylating agents