Which of the following statements about IL-12 is FALSE?
A) It activates macrophages.
B) It inhibits some tumor cells.
C) It activates the TH1 pathway.
D) It causes autoimmune diseases.
E) It causes TH cells to respond to HIV.
D
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The largest reservoir of carbon is
a. living organisms. b. oceans. c. sedimentary rocks. d. the soil.
Biotech barnyard animals produce which of the
following human products? a. a protein that treats cystic fibrosis b. a protein that counters the effects of a heart attack c. interleukin-2 that triggers divisions of certain human immune cells d. a protein that treats blood-clotting disorders e. all of these
Some invertebrates do not have special respiratory
organs and rely on __________ exchange, diffusion of gases across the body surface. Fill in the blank(s) with the appropriate word(s).
Which structure is involved in the genetic exchange (conjugation) between cells?
a. capsule b. fimbria c. pilus d. porin