A dissolved substance in water is a(n)____
a. solvent
b. solute
c. antioxidant
d. free radical
e. acid
ANSWER: b
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Rickettsia rickettsii are readily phagocytized by macrophages.Why doesn't this control the infection and prevent the development of Rocky Mountain spotted fever?
A. The bacteria are toxic for T cells and prevent the development of cell-mediated immunity. B. The bacteria escape from the phagosome and reproduce in the cytoplasm of the phagocyte. C. The bacteria interfere with the development of antibodies. D. The bacteria are unable to inactivate complement.
Sexual reproduction includes
a)mitosis, gamete formation, and fertilization. b)mitosis, meiosis, and gamete formation. c)meiosis, gamete formation, and fertilization. d)mitosis, fertilization, and meiosis. e)None of the answers are correct.
A specific aminoacyl-tRNA synthetase
a. has two binding sites. b. usually can bind more than one tRNA. c. usually can bind more than one amino acid. d. recognizes tRNAs only by information in the anticodon loop. e. must hydrolyze GTP to "charge" tRNAs.
Which of the following statements about hormones is not true?
A. Hormones are secreted by axons. B. Hormones are targeted to specific organs within the body. C. Hormones are carried by the bloodstream. D. It takes time to deliver hormones to the cells. E. The effects of hormones are long lasting.