Which of the following proteins of the complement cascade is an opsonin?
A. C5a
B. factor B
C. C3a
D. MAC
E. factor P
Answer: C
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If water were non-polar it would not form hydrogen bonds. At normal room temperatures this non-polar water would be _____
A. a gas B. a liquid C. a solid
Which of the following statements is not true of the two alternative hypotheses for how the force is generated to pull water up the xylem?
A. The pectin gel in which cellulose microfibrils are embedded in the cell wall causes water to flow into a partially dehydrated cell wall by osmosis. B. Water is drawn by capillary action into the spaces between cellulose microfibrils in partially dehydrated cell walls. C. Evaporation out of the stomata causes the cell walls of those cells lining the intercellular air spaces to become partially dehydrated. D. The pectin gel in which cellulose microfibrils are embedded in the cell wall is slightly positive in charge, restricting the diffusion of positively charged ions. E. Water loss to the air causes a decrease in water vapor in the air spaces in the leaf.
A capsule and phenoloxidase melanin synthesis are virulence factors contributing to the pathogenicity of which of the following organisms?
a. Aspergillus spp. b. P. brasiliensis c. B. dermatitidis d. C. neoformans
Which of the following has anticodons?
A) Messenger RNA B) Transfer RNA C) Ribosomal RNA D) RNA polymerase E) DNA