Which of the following cells are activated by the release of interleukin-10 from the helper T cells?
A) cytotoxic T cells
B) B cells
C) natural killer cells
D) macrophages
E) mast cells
Answer: D) macrophages
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Which of the following statements is false?
A. The cells of the epiblast and hypoblast differentiate into the three germ layers. B. The inner cell mass of the blastocyst forms the embryo. C. The outer layer of cells of the blastocyst forms the placenta. D. The placenta is composed of both maternal and embryonic cells. E. None of the answer options is false.
Genome analysis has revealed that horizontal gene transfer is frequently mediated by phages.
Answer the following statement true (T) or false (F)
A microorganism that can use ready-made folic acid from its environment and no longer needs to synthesize it from the PABA precursor demonstrates an example of what type of antimicrobial resistance mechanism?
A) alteration of an enzyme B) alteration of targets C) development of enzymes D) alteration of a metabolic pathway
Sami stepped into a strange, new house but sensed something that brought back a whole flood of memories about his beloved grandmother from long ago. Which sense most likely brought these special memories back?
A) vision B) olfaction C) tactile D) hearing