Which of the following tests works by detecting viral nucleic acid?
A) ELISA
B) PCR
C) Agglutination with beads coated with viral antigens
D) Agglutination with beads coated with either antibodies or antigens
E) Agglutination with beads coated with antibodies to the virus
Answer: B
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Breathing is usually regulated by
A. erythropoietin levels in the blood. B. the concentration of red blood cells. C. hemoglobin levels in the blood. D. CO2 concentration and pH sensors. E. the lungs and larynx.
A(n) ________ is an instrument used to separate subcellular structures and macromolecules on the basis of size, shape, and density. ________ developed this instrument in Sweden during the period 1925—1930.
Fill in the blank(s) with the appropriate word(s).
Cuticle, guard cells, stomata, and trichomes are all terms associated with
a. ground tissue. b. vascular tissue. c. meristem. d. dermal tissue. e. secondary tissue
Which of the following statements about components of the flu vaccine and their intended function is true?
A. Gelatin or sorbitol is used to enhance the ability of the immune system to detect the virus. B. Formaldehyde is used to inactivate toxins from the virus or bacteria that may have been present during production. C. Antibiotics are used as a preservative in multidose vials of vaccine in order to prolong their shelf life. Antibiotics allow the vaccine to withstand extreme temperature changes. D. Aluminum is included to prevent the growth of bacteria during vaccine preparation and storage.